Leonardo Dicaprio misses ex-girlfriend Gisele Bündchen.

Leonardo Dicaprio, 31, may have turned heads with Kirsten Dunst, 23, while clubbing on Nov. 12, but deep down he's playing "what if" over his split from supermodel Gisele Bündchen, 25. A source close to him tells Star People, "Leo told me, 'Did I make the biggest mistake of my life?' I think he'd like to tell Gisele that — but she isn't taking his phone calls. He misses that she's not around.". . . . . .Source: