Lance Bass celebrated his birthday a week early this year -- like a BOSS -- treating himself and several friends to a lavish, alcohol-fueled trip to the Caribbean ... and TMZ has learned Lance paid for the entire thing.

A rep for Lance tells TMZ, the former 'N Sync singer flew his boyfriend (above) and 10 friends to St. Martin from last Thursday to Sunday -- and stayed in a luxury villa at the island's La Samanna Resort & Hotel that ran $4,000-a-night.

Lance also sprung for a day of jet skiing at $100/hour ... got a private V.I.P. table Saturday night at Tantra nightclub.



We're told the final bill totaled $20,000 -- but the hotel stepped in and comped a bunch of stuff, including the hotel room. Still, Lance sprung to cover the balance ... which wasn't too shabby ... and his friends didn't have to pay a dime.

Even rich people like free stuff.

Former *NSYNC boy bander Lance Bass showed off his trimmed pecs and abs by going shirtless while on the beach in Miami on Thursday.

There's nothing like soaking up the sun with a six-pack.

Apparently, NY Jets quarterback Mark Sanchez has an off-season regimen that includes Bon Jovi songs and late nights with Lance Bass.


Bass and Sanchez hooked up for a karaoke duet at the Canal Room in NYC this past weekend.

The two busted out a version of "Livin' on a Prayer" -- and we're told it was actually pretty good.

"We got each other and that's a lot ... for love."

Former *NSYNC bandmates Lance Bass, 30, and Joey Fatone, 33, frolicked on the beach in St. Maarten this weekend.



Question is ...

There's one thing the CA Supreme Court can't stop ... Kathy Griffin's "box-of-wine-drinking" mom from toasting gay marriage.



The "D-List" star and her 89-year-old mom Maggie -- along with Lance Bass -- were just some of the thousands who marched in last night's anti-Prop 8 rally in West Hollywood.

While Maggie was in a wheelchair, she didn't drink and drive.

Usually, it's the assistant's job to make life easier for their boss -- but last night, it was Lance Bass' "drunk ass" sidekick who ended up needing the wannabe cosmonaut to drive her home after a wild night.


That being said, she's the nicest drunk girl we've ever met.

Has a member of the lollipop guild gone AWOL?!

Oh, wait. It's just Lance Bass in an extra special nuclear shade of orange for the "Dancing with the Stars" finale.

Spray 'em if you got 'em.

Lance Bass likes the mens -- but a great rack is a great rack.

Lance Bass thinks Obama is a bad ass -- and clearly it takes one to know one, check out that eye liner!

Everyone was there to see the NKOTB -- but Lance Bass stole their thunder at last night's concert at the Staples Center in L.A.

A few TMZ staffers actually admitted to going to the show and shot this "Where's Waldo"-like footage of Lance getting swarmed in the crowd.

Has Lance been pulling a "Chuck and Larry" this whole time just to bag girls?

Lance Bass was all over his dance partner Lacey Schwimmer on "DWTS" last night -- and then left One Sunset with a car packed full of chicas afterwards. OK, so his BF was at the club too ... but they didn't go home together.