Robert Pattinson and Kobe Bryant
Taylor Hill/FilmMagic; Vince Flores / AFF
09/25/2012 at 06:00 AM EDT
A slam dunk for Twilight
stepped out Sunday night to attend Emmy host Jimmy Kimmel's after party at Soho House in Los Angeles.
Joined by a male friend, Pattinson was dressed casually in a baseball cap and jacket, but every girl in the room was "trying to get his attention," an onlooker tells PEOPLE.
Inside the star studded event, guests sipped on Don Julio margaritas and Bulleit Bourbon Old Fashioned cocktails and snacked on sliders from Umami Burger.
Samantha Ronson deejayed a set full of current hits and classic rock while nominees, winners and guests including Breaking Bad
's Aaron Paul and Bryan Cranston, Ellen DeGeneres and Portia De Rossi, Downton Abbey
's Michelle Dockery, L.A. Laker Kobe Bryant and more enjoyed the evening.
"At one point Rob approached Kobe to say hi and tell him he was a big fan," the source adds. "Kobe said the same right back to him!"
– Jennifer Garcia