Jennie Garth Knows All About Robert Pattinson's Love Life

By Steve Helling

08/13/2009 at 01:55 PM EDT

Jennie Garth has the answer to Hollywood's hottest mystery.

For months, speculation has swirled around the romantic life of Twilight star Robert Pattinson. Is he dating his onscreen leading lady Kristen Stewart? Or is he with Nikki Reed? And what about his Remember Me costar Emilie de Raven?

Well, Garth – whose husband, Peter Facinelli, costars in the vampire series – says that she knows the truth about Pattinson's love life.

Speaking to reporters at theT.J. Maxx and Save the Children's Back to School Program last week, the 90210 actress said Faccinelli comes home and tells her the scoop about his costars. But Garth isn't spilling any secrets.

When asked who Pattinson is really dating, she played coy. "I can't say," she answered laughing. "That will be breaking my promise to my husband. But I do know."

• Reporting by DEBRA LEWIS-BOOTHMAN