“Extra’s” Gossip Girl has the scoop on Robert Pattinson’s latest mystery girl!
Turns out the beauty, Sidney Leibs, is his trainer, and she’s helping the “Twilight” star get in shape for his new thriller, “Mission Blacklist.”
This week, Gossip Girl dishes on Lady Gaga and Rihanna. Watch the video!
To find out how a picture of RiRi got two people arrested, visit GossipGirl.com.