Jennifer Aniston wields a few weapons on ‘Jimmy Kimmel Live’

Jennifer Aniston can be a lot of fun on late-night when she doesn’t have anything to promote.

Free of the obligation to talk about any upcoming projects and appearing on “The Jimmy Kimmel Show” purely “out of love,” as the host put it, Aniston helped her pal launch his show in its new 11:35 p.m. time slot, wielding weapons including a sledgehammer, a pair of scissors and yes, embarrassing vacation photos.

She used the first to take out Kimmel’s new desk while declaring “out with the old, in with the new!” and noting the show’s time change. And how on Earth could that “mistake” happen?

A love timeline: Jennifer Aniston and Justin Theroux

“You’d think that one of our staff members, seeing you with the sledgehammer, would have said something before you came out,” Kimmel said, deadpan. “This makes no sense at all.”

“It actually makes no sense at all,” Aniston agreed.

“Like zero. Like a little bit less than zero sense, even. Well, what are ya gonna do,” he said.

At least they started out with a bang, literally, before the vacation pics came out. Kimmel and his wife were part of the group that hit Cabo recently with Aniston and her fiancee, Justin Theroux, and was captured via cellphone camera at the spa getting a mani-pedi and massage. He was also snapped while nauseated on a boat, but the pics didn’t chronicle that adventure in detail.

Finally, it was time to cut hair.

Not Jen’s, mind you — leave that to the experts. Turns out Aniston has a hair-cutting history, from back when she was in seventh or eighth grade, and Jimmy was the guinea pig this time around.

“It’s been 30 years since my last haircut,” she confessed. “So let’s do it!”

Kimmel, for the record, survived.

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PHOTOS: Celebrity portraits by The Times