(Editor's note: The VMAs are a big assignment, and with this year's show taking over Las Vegas all week long, our friends at Us Weekly are helping us make sure we've got every glittering inch of the Strip covered. You'll see their celebrity reporting here at MTV.com this week, and you'll find our music reporting over at UsMagazine.com.)

Britney Spears' motto for her weekend in Las Vegas: "Gimme more." With buzz building about her big VMA stage show, the singer, 25, was in typical form the night of September 8, hitting the Vegas clubs until the wee hours of the morning and hobnobbing with celeb friends: including her former bff Paris Hilton and new pal Diddy!

(Check out photos from Brit's big night right here.)

Her first stop after checking out a Cirque du Soleil show at Treasure Island with four pals was The Hard Rock Café, where 50 Cent was throwing a huge soiree. Spears, wearing a slinky spaghetti strap dress and a tan fedora hat, arrived at 12:27 am and, though it may have been 50's party, she was clearly the guest of honor. After the pop star found a VIP booth with Diddy, 37, and Hilton, 26, the DJ shouted out, "Give it up for Britney Spears!" and the crowd erupted in cheers.

After Hilton made her way to another club (so many parties, so little time), Spears followed Diddy over to Tao at 1:30 am, where the two chilled in a corner booth, drawing stares from fellow revelers. "She was dancing and having a good time with Diddy all night," says an eyewitness, who spotted the mom of two swilling cocktails with her rapper pal at club Jet after 2am. "She was drinking and letting off steam." The partying duo finally left Jet close to 3am.

But the night was still young! Two hours after leaving the club, a lollipop-sucking Spears (wearing a white t-shirt, jeans and a straw fedora) was spotted heading to Diddy's suite at the Palms Hotel Fantasy Tower with two gal pals. Shortly after her arrival at the rapper's after-after party, Spears and one of her friends went to the upstairs portion of the suite with Diddy following closely behind.

No word on when Spears actually went to bed, but she was still out and about at dawn: a mere 12 hours before her VMA performance.

Wait -- don't cash out on the VMAs just yet! From Britney's sultry comeback performance to the big winners, you saw it all -- well, almost everything! Get yourself even richer with our wall-to-wall show coverage, party reports, videos and loads more at www.VMA.MTV.com. For reports, photos, video and much, much more from previous VMAs, dive into the VMA archives.