blonde Sienna Miller  autographs smile Mr. Paparazzi

Sienna Miller was positively glowing as she launched her new collection for Twenty8Twelve, her clothing line with sister Savannah, at Selfridges department store in London Monday.

And even though Sienna is celebrating something new, she's also getting over her old boyfriend. Miller split (for the second time) with Jude Law earlier this year, but the playboy actor may have already moved on with another woman!

Law reportedly reunited with model Lily Cole at a London nightclub last week, after the pair dated briefly in 2008 (before he hooked up with Sienna again.)

"Jude and Lily were at a table kissing and being very flirtatious," a witness tells the Daily Mail. "It was clear they were comfortable with each other."

I guess Jude likes to recycle!