Karaoke is only fun when it's not taken seriously (no one wants to hear you belt out that Adele song perfectly) and though she has killer pipes, Katy Perry is well aware of that rule.

The 27-year-old pop star looked and sounded like she was having a blast when she took the stage at a karaoke bar on Catalina Island called El Galleon, reports TMZ.

A video posted on YouTube on Wednesday shows the singer, who used the stage name "Katherine," and a pal rapping along to Will Smith's 1998 jam "Welcome To Miami."

The duo did karaoke the right way -- with plenty of humor. You can see Katy's natural stage presence coming through as she adds her own zany brand to the song.

It also sounds like the singer might have had a couple of drinks before she hit the stage, as she slurred, "I looove my best friend."

Perry's divorce from husband of 14 months Russell Brand was finalized on July 16, so perhaps she was celebrating her official status as a single woman.

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  • Katy Perry

    Singer Katy Perry during the Jimmy Choo annual Oscar Collection Preview and Tea at the Peninsula Hotel on February 23, 2004 in Beverly Hills, California. (Photo by Amanda Edwards/Getty Images)

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    Singer Katy Perry arrives at The Abbey / Esquire Magazine 'The Envelope Please' Oscar Viewing Party on February 27, 2005 at The Abbey in West Hollywood, California. (Photo by Amanda Edwards/Getty Images)

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    Musician Katy Perry attends the official launch of Ubisoft's 'Assassin's Creed' at the Club Opera on November 6, 2007 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images)

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    Musician Katy Perry attends the Katy Perry record release party for 'One of the Boys' at Capitol Records on June 17, 2008 in Los Angeles, California. (Photo by Jesse Grant/Getty Images for EMI Music)

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    Singer Katy Perry attends the Katy Perry Concert at Fritzclub at the Postbahnhof on September 17, 2008 in Berlin, Germany. (Photo by Florian Seefried/Getty Images)

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    Singer Katy Perry attends a post concert party at The Griffin on July 28, 2009 in New York City. (Photo by Amy Sussman/Getty Images for The Griffin)

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    Katy Perry will be hosting the MTV Europe Music Awards for the second year running. The show will broadcast live from Berlin on MTV on 5 November. (Photo by Dave Hogan/Getty Images)

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    Katy Perry poses backstage during the Louis Vuitton Pret a Porter show as part of the Paris Womenswear Fashion Week Spring/Summer 2010 at Cour Carree du Louvre on October 7, 2009 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)

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    Singer Katy Perry poses with two MTV Awards prior to the Press Conference of the MTV Europe Music Awards 2009 at the O2 Arena on November 4, 2009 in Berlin, Germany. (Photo by Dave Hogan/Getty Images)

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    Katy Perry poses during the Grammy Nominations Concert in Los Angeles on December 2, 2009. The 52 annual Grammy Awards will take place on January 3, 2010. Beyonce topped the list of nominees for the 52nd Grammy Awards, leading the way with 10 nods ahead of teenage country star Taylor Swift with eight. AFP PHOTO / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)

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    Singer Katy Perry arrives at the 3rd Annual Art Of Elysium 'Heaven' Gala Event in Beverly Hills on January 16, 2010 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

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    Singer Katy Perry arrives at Nickelodeon's 23rd Annual Kids' Choice Awards held at UCLA's Pauley Pavilion on March 27, 2010 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

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    Singer Katy Perry attends the Costume Institute Gala Benefit to celebrate the opening of the 'American Woman: Fashioning a National Identity' exhibition at The Metropolitan Museum of Art on May 3, 2010 in New York City. (Photo by Larry Busacca/Getty Images)

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    Katy Perry arrives at the 2010 MTV Movie Awards held at the Gibson Amphitheatre at Universal Studios on June 6, 2010 in Universal City, California. (Photo by Kevin Winter/Getty Images)

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    Singer Katy Perry poses for a photo during a taping of NBC's 'Today' in Rockefeller Center on August 27, 2010 in New York City. (Photo by Jemal Countess/Getty Images)

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    Singer Katy Perry arrives on the red carpet for the 2010 MTV Video Music Awards at the Nokia Theater in Los Angeles on Sepetember 12, 2010. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)

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    Singer Katy Perry performs onstage at the GRAMMY Nominations Concert Live! at the Club Nokia on November 30, 2010 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

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    Singer Katy Perry performs onstage during 'VH1 Divas Salute the Troops' presented by the USO at the MCAS Miramar on December 3, 2010 in Miramar, California. 'VH1 Divas Salute the Troops' concert event will be televised on Sunday, December 5 at 9:00 PM ET/PT on VH1. (Photo by Kevin Winter/Getty Images for VH1)

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    Katy Perry attends Z100's Jingle Ball 2010 at Madison Square Garden on December 10, 2010 in New York City. (Photo by Jason Kempin/Getty Images)

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    Singer Katy Perry arrives at The 53rd Annual GRAMMY Awards held at Staples Center on February 13, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

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    Singer Katy Perry performs onstage during the 53rd Annual GRAMMY Awards held at Staples Center on February 13, 2011 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

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    Katy Perry performs on the opening night of her 'California Dreams' UK tour at Hammersmith Apollo on March 17, 2011 in London, England. (Photo by Neil Lupin/Getty Images)

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    Katy Perry attends the premiere of 'The Smurfs' at the Ziegfeld Theater on July 24, 2011 in New York City. (Photo by Jemal Countess/Getty Images)

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    Singer Katy Perry arrives at the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

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    Singer Katy Perry, winner of the Video of the Year Award for 'Firework', Best Collaboration Award (featuring Kanye West) for 'E.T.' and Best Special Effects in a Video for 'E.T.' poses in the press room during the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

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    Recording artist Katy Perry attends the House of Hype's 2011 MTV Video Music Awards After Party at the SLS Hotel on August 28, 2011 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)

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    Singers Rihanna and Katy Perry in the audience at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Larry Busacca/Getty Images For The Recording Academy)

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    Singer Katy Perry arrives at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

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