Hayden Panettiere & Jesse McCartney K-I-S-S-I-N-G!

(Photo: Splash News Online) We're seven hours late for work today because we partied at Crown Bar until we passed out - no, not from drinking, from shock. It happened right after we saw 19-year-old Hayden Panettiere ALL OVER Jesse McCartney.

And when we say ALL OVER, that's exactly what we mean. She was holding him tighter than Michael Phelps gripping that bong. The Heroes star was sitting on Jesse's lap while he kissed her neck. Then she got up and did some crazy sexy dance in his lap.

So, it looks like goodbye Milo!

It must be over between Hayden and her long-time squeeze Milo Ventimigla, 31, because after her inside PDA with Jesse, 21, they went outside to smoke and he wrapped his arms around her from behind and was kissing her neck again. (It started to look like an episode of True Blood; dude has some sort of next fixation for sure.)

In the middle of this, a girl approached Hayden to ask for her autograph on the back of a store receipt. Hayden was nice enough to oblige.

Girl, don't even try to talk your way out of this with Milo. That is, of course, if he's still in the picture. We saw it with our own bloodshot eyes.