Jennifer Aniston and John Mayer are Back On!

Betsy Waldman / October 15, 2008

It looks pretty much official: Jennifer Aniston has given her paparazzi-challenged ex John Mayer a second chance to step up to the plate in the romance department.

Us notes that the two reunited

cargo-pants-wearing lovebirds went to a romantic dinner at Sunset Tower’s Tower Bar in West Hollywood last night.

“They looked like they had the best time,” said a witness. “They were holding hands at one point and seemed very much back on. She seemed extremely happy to be back with him.”

And, well, the camera doesn’t lie—Jen looks like she’s smiling in these photos. She probably realized that the old Maniston magic was gonna kick in once they hopped in the car after dinner.

Have fun, Jen…but try not to forget the lessons learned from past mistakes.