Newly engaged Jennifer Aniston was back at work on Monday on the set of her new movie "We're The Millers" in North Carolina, and everything was business as usu -- wait a minute. What's that on her left hand?

Aniston's already sported bangs and frumpy clothes for her role, but she's made some big life changes off the set too -- she got engaged to her beau of a year, Justin Theroux, earlier in August.

And now, of course, fans have been on a fervent Ring Watch, hoping to catch a glimpse of the 43-year-old actress' sparkler, which is reportedly an eight-carat "huge emerald-cut diamond" with "tapered diamond baguettes." So far, though, she's been sly about flashing her bling -- which is probably why photographers were excited to spot her with a ring on her finger on set on Monday.

While some people are claiming this is Jen's sparkler from Justin, we're dubious. First of all, her rock is supposed to be eight carats, which would be, uh, pretty visible, right? We're not seeing any of that here. Further, Jen is obviously in full wardrobe for her role as Jason Sudeikis' prostitute wife, which would probably entail her wearing a wedding band.

So, we're not uncrossing our fingers yet -- we suspect Aniston's big fat diamond has yet to be seen.

But! Take a look below and tell us what you think.

PHOTO:

jennifer aniston ring

Check out Jen's style evolution below!

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  • July 1990

    Photo: Barry King/WireImage

  • 1994

    Cast of "Friends" (left to right): Lisa Kudrow, Matthew Perry, Jennifer Aniston, David Schwimmer, Courteney Cox Arquette and Matt Leblanc. Photo: Getty Images

  • June 1995

    Photo: Terry McGinnis/WireImage

  • July 1997

    Photo: Ke.Mazur/WireImage

  • April 1998

    Photo: Kevin Mazur Archive/WireImage

  • September 1999

    Photo: Jeff Vespa/WireImage

  • March 2000

    Photo: SGranitz/WireImage

  • March 2000

    Photo: Evan Agostini/Getty Images

  • September 2000

    Photo: Scott Gries/ImageDirect

  • January 2001

    Photo: Scott Nelson/AFP/Getty Images

  • February 2001

    Photo: Kevin Winter/Getty Images

  • January 2002

    Photo: LUCY NICHOLSON/AFP/Getty Images

  • May 2002

    Photo: LUCY NICHOLSON/AFP/Getty Images

  • June 2002

    Photo: Amy Graves/WireImage

  • September 2002

    Photo: Gregg DeGuire/WireImage

  • January 2003

    Photo: Robert Mora/Getty Images

  • September 2003

    Photo: Jeffrey Mayer/WireImage

  • January 2004

    Photo: Carlo Allegri/Getty Images

  • February 2004

    Photo: Dave Hogan/Getty Images

  • May 2004

    Photo: Evan Agostini/Getty Images

  • September 2004

    Photo: Kevin Winter/Getty Images

  • October 2005

    Photo: Evan Agostini/Getty Images

  • March 2005

    Photo: Evan Agostini/Getty Images

  • March 2006

    Photo: David Livingston/Getty Images

  • May 2006

    Photo: Frederick M. Brown/Getty Images

  • May 2006

    Photo: James Devaney/WireImage

  • June 2006

    Photo: Patrick Riviere/Getty Images

  • June 2006

    Photo: Sean Gallup/Getty Images

  • October 2006

    Photo: Kevin Winter/Getty Images

  • December 2006

    Photo: Charley Gallay/Getty Images

  • January 2007

    Photo: Stephen Shugerman/Getty Images

  • April 2007

    Photo: Mark Davis/Getty Images

  • December 2008

    Photo: Kevin Winter/Getty Images

  • February 2009

    Photo: Frederick M. Brown/Getty Images

  • February 2009

    Jason Merritt/Getty Images

  • March 2009

    Photo: Gareth Cattermole/Getty Images

  • May 2009

    Photo: Andrew H. Walker/Getty Images

  • June 2009

    Photo: Frazer Harrison/Getty Images

  • September 2009

    Photo: Frederick M. Brown/Getty Images

  • January 2010

    Photo: Kevin Winter/Getty Images

  • March 2010

    Photo: Ian Gavan/Getty Images

  • March 2010

    Photo: Stephen Lovekin/Getty Images

  • March 2010

    Photo: Pascal Le Segretain/Getty Images

  • March 2010

    Photo: Carlos Alvarez/Getty Images

  • August 2010

    Photo: Jason Merritt/Getty Images

  • February 2011

    Photo: Andreas Rentz/Getty Images

  • March 2011

    Photo: VIctor Chavez/WireImage

  • July 2011

    Photo: Dave M. Benett/Getty Images

  • July 2011

    Photo: Gareth Cattermole/Getty Images

  • September 2011

    Photo: James Devaney/WireImage

  • September 2011

    Photo: Jason Kempin/Getty Images

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