X17 XCLUSIVE FIRST PIX - Avril Lavigne And Brody Jenner Caught Kissing

So much for getting back together with ex-husband Deryck Whibley!

Yesterday afternoon we caught Avril Lavigne and on again/off again fling Brody Jenner lunching and snuggling at the Chateau Marmont in Hollywood, and though they've hooked up before, no one got pictures of the twosome -- until now!

An X17 photographer on the scene tells X17online exclusively:

"Avril and Brody weren't exactly trying to hide the fact that they were together! They were leaning on each other, and when they left, they exchanged a long smooch and Avril had her hands all over Brody. Judging from their behavior, it seems like we'll be seeing more of them out and about!"

But is she doing this out of love or is this simply a ploy to make her ex-hubby jealous? After all, they got matching tattoos just last month!