Ashlee Simpson and Fall Out Boy’s frontman boyfriend Pete Wentz hold hands while out partying together at Hollywood’s latest hot spot Parc on Saturday night.

The on-again-off-again rocker couple were spotted kissing and cuddling inside Parc.

“They definitely weren’t hiding the fact that they were together,” said one onlooker. “They were making out a lot and they were pretty intense.”

Ashlee, 22, and Pete, 27, have been together since September 2006.

It’s been rumored earlier this week that Ashlee has found an unlikely music legend to help her record her new album - The Cure rocker Robert Smith. Smith will reportedly sing alongside Ashlee on a track to follow-up her 2005 album I Am Me.

Fall Out Boy announced on Friday that they have to delay their national tour because of “personal issues.”

Hot off her vacation in Cabo San Lucas with rumored boyfriend Pete Wentz (Fall Out Boy), a very tanned Ashlee Simpson leads her pack of bronzed buddies as they arrive at LAX Airport on Monday night.

Ashlee, 22, and Pete, 27, vacationed at the Esperanza Resort in Cabo.

Ashlee’s ex, Desperate Housewives star Josh Henderson, is rumored to be dating Paris Hilton. The pair have been spotted out and about on multiple occasions.

Fall Out Boy’s Pete Wentz denies he’s dating Ashlee Simpson in the upcoming issue of Rolling Stone. Page Six reports:

Unfortunately for Ashlee Simpson, holding hands and making out on a regular basis with Pete Wentz still won’t make you his girlfriend. Wentz insists the two are not an item and told Rolling Stone, “Maybe in a different universe, we’d be some hot couple, but not in this one.” Wentz even goes as far as to take a veiled swipe at his close “friend,” saying, “I’m attracted to creative people and train wrecks, and there’s no shortage of that in Los Angeles.”

I guess it takes a lot more than PDA to make a couple in Hollywood!

Sexy songstresses Christina Agulilera, Ashlee Simpson, Rihanna, LeAnn Rimes, and Pink sashay down the red carpet 2007 in their slinky dresses at music mogul Clive Davis‘ pre-Grammy Awards Party on Saturday night at the Beverly Hills Hilton in Beverly Hills, Calif.

Apparently before Ashlee walked up, her father and manager Joe Simpson instructed press not to ask any personal questions.

Pink performed a cover of Janis Joplin’s “Me & Bobby McGee.”

WATCH LIVE :: If you’re still awake, you can watch the live performances from the pre-Grammy party here.

UPDATE :: Added pictures of Christina Aguilera ’s performance of “Makes Me Wanna Pray”!