FIRST THERE WAS NICK

First Nick, now Joey! Porn star Jessica Jaymes has a huge appetite for members of boy bands.

The red-hot brunette got Nick Lachey of 98 Degrees into hot water with his wife Jessica Simpson, as The ENQUIRER previously revealed, when she put on a steamy X-rated girl-on-girl show during a bachelor party for Nick’s longtime soundman.

Now comes word that the 25- year-old porn queen got cozy with *NSYNCer Joey Fatone in Las Vegas last January — just six months after he’d gotten engaged to his high school sweetheart Kelly Baldwin!

Joey, 27, married Kelly — the mother of their 3 1/2-year-old daughter — in a lavish September 9 ceremony at Long Island, N.Y.’s Oheka Castle. Jessica — Hustler magazine’s Honey of the Year — had hooked up with Joey during the Adult Entertainment Expo in Las Vegas, say sources.

“They struck up a conversation at one of the Expo booths on January 8, and one thing quickly led to another,” said a pal of the pornagain actress.

The sex star had brought her fiance to Vegas with her — and she didn’t want to get caught with Joey. So she took Joey to a female friend’s suite and allegedly made love to him — while her friend was asleep in another room, said the pal.

Continued a source close to Jessica: “Joey was immediately taken with Jessica — and she was especially impressed because Joey was a fan of some of her films. “Jessica told me, ‘Joey and I got together and ended up fooling around. He was really sexy and very sweet to me.’ “

The next night the porno princess flashed her breasts at a disco in the Hard Rock Hotel during a party sponsored by Hustler magazine. And Joey was on hand to catch all the “fun.”

TORRID AFFAIR
“Jessica had undoubtedly told Joey she was going to be there because Joey showed up — along with fellow *NSYNC singer Lance Bass and Backstreet Boy A.J. McLean,” said the pal.

But that wasn’t the end of it. “Jessica told me that she saw Joey for a while after their first night,” confided the close source. “It was a quick, torrid affair that flamed out after a few weeks.

“Jessica never mentioned to me that Joey had a fiancee at the time of their little fling, but I don’t think he ever told Jessica.

“I’m sure that when Joey’s wife hears of his torrid affair with Jessica, she’s going to really give him hell.”

Concluded the pal: “Jessica must have this thing for boy band members. Someone better tell Cameron Diaz to lock up Justin Timberlake!”

— MICHAEL GLYNN, RICK EGUSQUIZA and JOHN SOUTH