11/12/2012 02:41 pm ET Updated Dec 06, 2017

Leonardo DiCaprio, Margot Robbie: 'The Wolf Of Wall Street' Co-Stars Get Cozy At Actor's Birthday Bash

Leonardo DiCaprio may have just ended things with his girlfriend of almost a year, Erin Heatherton, but the actor is reportedly cozying up to his beautiful blond co-star.

DiCaprio and former "Pan Am" star Margot Robbie have allegedly sparked up a new fling, spending an increasing amount of time together. The New York Post reports that the Australian actress, 22, was spotted at DiCaprio's 38th birthday bash, which was held at The Darby in NYC on Saturday night (Nov. 10), and was recently seen partying with her "Wolf of Wall Street" co-star in Las Vegas.

At the birthday celebration, DiCaprio and Robbie were joined by their director Martin Scorsese and co-star Jonah Hill, as well as ton of other A-list stars like Beyoncé, Jay-Z, Robert De Niro, Cameron Diaz, Mark Ruffalo, Edward Norton, Jamie Foxx, Emma Watson, Swizz Beatz, Chris Rock and many more.

"Things got pretty crazy," Lino Meoli, who DJ'ed DiCaprio's party, told the New York Daily News. "Leo was on the mic beat-boxing to 2 Chainz and had all his buddies up [on] stage."

And although he is rumored to be interested in Robbie, another source told the Daily News, "He really wasn’t flirting with anyone. It was a boys affair.”

But DiCaprio, who partied until 5 a..m, wasn't only celebrating his special day. The actor raised money for charities supported by the Leonardo DiCaprio Foundation and reportedly made a $500,000 donation to the American Red Cross to benefit Hurricane Sandy Relief.

See a photo of DiCaprio and Robbie filming together below.

leonardo dicaprio margot robbie