Katie Cassidy, Jesse McCartney are Engaged, Says LC

Love is in the air for hot young stars Katie Cassidy and Jesse McCartney, both 20, who have been together and smitten with each other for awhile.

But now, there's a rumor that they're engaged - and it comes from a source close to Katie - her good friend, The Hills star, Lauren Conrad.

On a bulletin posted by LC on MySpace, Katie, Jesse and LC's pals Whitney Port and Audrina Patridge met Lauren for dinner. That was when, according to LC...

"Then he got down and asked her. It was so sweet! Everyone was clapping afterwards."

After dinner, the happy bunch made their way out to club Mood to celebrate - appropriately, the same club where just last year, a photo of an underage Jesse McCartney drinking beer surfaced, launching an investigation of Mood.

Good to see he's hanging out there again. So is this rumor for real? When a rep for the Nick Carter knock-off was asked for comment on the engagement rumors regarding McCartney and Cassidy, he replied simply, "No, not engaged."

Hmm. Maybe it was just wishful thinking on the part of Lauren Conrad, BFF of Katie?

We'll see. In any case, Heidi Montag and her new, fake boobs were nowhere to be seen.