Jake Gyllenhaal Reunites With an Ex!

Jake Gyllenhaal Reunites With an Ex!

When Jake Gyllenhaal dined on French food in Montreal recently, he was surrounded by seven pals -- including one of his famous ex-girlfriends.

Who was it?  

In this "Hot Stuff" video, Us Weekly's Senior Editor Ian Drew -- and Kendra James of new Bad Girls Club spin-off Love Games -- reveal the woman at Gyllenhaal's happy reunion.

PHOTOS: Remember these celeb splits?

Also in the roundup of Us exclusives: how Justin Timberlake got seriously flirty with a Vegas cocktail waitress while girlfriend Jessica Biel was across the country;  Lindsay Lohan explains her surprising lawsuit against ETrade and its "milkaholic" ads, and Kate Winslet insiders talk about about her sudden split from Sam Mendes.

Watch the exclusive clip now (above)!