Three Brits and a Yankee gal!

Robert Pattinson and love Kristen Stewart knocked back drinks at London's Groucho Club with Sienna Miller and actor Tom Sturridge, Pattinson's old pal from the Harrodian School, on Sept. 8.

"They looked happy," a witness tells Us Weekly. Get more details on the unexpected quartet's hang time in this week's Hot Stuff video, as told by Senior Editor Ian Drew with the stars of Basketball Wives Los Angeles.

Also in the roundup: More on Alex Rodriguez and Cameron Diaz's split, the Real NYC Housewives shakeup, a Jersey Shore showdown and more!

Watch the clip now.