Hollywood Dirt: Rihanna Tweets Super Sexy Topless Pic, Miley Denies 3 Weddings Rumor & More

RIHANNA SHOWS US HER PICS - POSTS TOPLESS PHOTO: RIHANNA sprawled on a black leather couch, wearing ankle boots, thigh-highs held up by garters and well, nothing else. Interested? Yes, please!

Obviously still feeling sexy after her Wednesday night performance at the taping of the Victoria’s Secret lingerie show in New York, Ri went back to her trailer and posed all super-sexy, then shared it on Twitter for all to see.

Meanwhile ... JUSTIN BIEBER was backstage flirting up a storm. Witnesses say the Bieb was acting like a kid in a candy store while surrounded by dozens of the most beautiful women on the planet.

One source told the New York Post, he was, quote, “hitting on the girls all day.” And word is, one of them flirted back hard. Her name is Cara Delevingne. She has a history with pretty-boy singers. In fact, her previous boyfriend is One Direction’s HARRY STYLES.

Cara Tweeted a pic of her and Justin together, and at the after-party, the Post's source says she was spotted “climbing toward Bieber’s table to chat to the singer, maneuvering over a banquette in a sexy, short and tight black dress.”

IN DENIAL - MILEY CYRUS: MILEY CYRUS is denying rumors that she and LIAM HEMSWORTH are having three weddings. Miley poo-poohed the word on the street on "Ellen" yesterday, saying, quote, "There is some rumor going around that I'm having like 47 weddings. I'm not. I'm having one wedding."

But don't hit up Target for a gift yet. It's not happening any time soon because Miley wants to focus on her music right now. Here's video of her appearance. If you stay to the end you'll see Ellen throw Miley a mini-bachelorette party that includes male strippers!

SNAPSHOT - AN ARMY OF KARDASHIANS: This is either a dream come true or your worst nightmare, depending on how you feel about THE KARDASHIANS.

KIM and KOURTNEY had an army of "Kardashian look-alikes" -- Kimbots, if you will -- show up to an event in London to model their new clothing line. Observe: (PHOTO), (PHOTO)

COULD BE TRUE, COULD BE CRAP - CHRISTINA AGUILERA HITS ON VANESSA HUDGENS: According to the not-always-reliable "Star,” CHRISTINA AGUILERA tried to get all smoove up in VANESSA HUDGENS.

The tab claims XXX-Tina tried talking her into a three-way with her and her boyfriend! Aw, man. I would give just about anything for this story to be true, but, sadly, I don’t think it is.

It happened, supposedly, allegedly, maybe, at a party last month. Their source says Christina, quote, “spent a lot of time on the dance floor gyrating next to Vanessa, who looked like she was having fun with the situation in a good-natured way.” But “the more Christina drank, the more her kinky side seemed to come out,” continued the source. "Christina stumbled over to Vanessa and begged her to come back home with her and Matt. Vanessa was taken aback but smiled and politely declined the offer."

SNAPSHOT - LADY GAGA IN A BIKINI: Are you up for seeing what all LADY GAGA can stuff into a bikini? (PHOTO), (PHOTO)

BABY POOP - REESE WITHERSPOON'S SON MAKES DEBUT: After stalking her for weeks, the paparazzi have finally snapped the first pictures of REESE WITHERSPOON'S new baby boy. Ladies and gentlemen, meet five-week-old Tennessee ... (PHOTO) (PHOTO)

'DANCING' HOST BROOKE BURKE HAS CANCER: "Dancing with the Stars" co-host BROOKE BURKE-CHARVET has revealed she’s battling thyroid cancer. Burke, who made the announcement via a YouTube video, says she'll have to undergo thyroid surgery and have a thyroidectomy.

CELEBRITY EYE CANDY - DAVID BECKHAM’S NEW HOLIDAY PRINT AD: Check it, ladies ... and perhaps some gentlemen? ... DAVID BECKHAM shirtless and in tight boxer briefs. You down with that?