We've learned Mel Gibson's girlfriend, Oksana Grigorieva, is pregnant with his child.

Our sources say Gibson has already told his estranged wife, Robyn, and their children about the news. We're told Oksana is in her second trimester.

Robyn filed for divorce on April 13.

By the way, Oksana is living in a house Mel got for her. And guess what else? Until recently, Oksana was living in a house purchased by songwriter/producer David Foster, with whom she also had a relationship.

Katy Perry crossed the line when she showed favoritism for "American Idol" favorite Adam Lambert last week -- and unless you DVR'd the live show, you'll never see her pink Glambert cape again.

If you go on iTunes and purchase Katy's performance from last week's "Idol", the closeup of her silk Glambert billboard has been altered -- you can't even tell there's writing on the cape.

The rest of the video is exactly the same -- we put the two different versions side-by-side so you can see.

Fox and iTunes both declined to comment.

Probably not the smoothest move ... LeAnn Rimes and Eddie Cibrian "ran into each other" at a bar inside the Staples Center during halftime yesterday.

L.A. Laker Pau Gasol was player of the game -- on the court ...