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Amid a report that she's pregnant with her first child, pop diva P!nk was spotted wearing baggy overalls outside a hardware store near Malibu on Wednesday.

To celebrate having the #1 song on the Billboard charts, 23-year-old pop star Ke$ha stripped off her hot pants, eye glitter, neon body paint and ripped stockings to reveal a sexy black bikini in Australia on Wednesday.

Looking fresh-faced and fit -- Lindsay Lohan was spotted arriving at an outpatient house near the Betty Ford clinic yesterday ... where's she's expected to stay until January.

"Hellcats" hunk Matt Barr showed off his devilishly hot and trimmed pecs, biceps and abs while working out shirtless in Beverly Hills this weekend.

Robert Pattinson and Kristen Stewart shared a big, fat, wet kiss in Rio de Janeiro this weekend ... but it couldn't have been more scripted.

Dressed to the nines in a blue dress and black stilettos, "Real Housewives of Beverly Hills" star Kyle Richards did her own dirty work and moved her recycling bin to the curb this weekend.

After enjoying lunch at a restaurant along the Sunset Strip, "American Idol" judge Steven Tyler became friendly with a statue of a guitar on the street.

With her parents in the middle of a divorce, underage Disney pop princess Miley Cyrus, 17, threw back a Corona cerveza at a club in Madrid, Spain last night ... where the legal drinking age is technically 18 -- but there's a catch.

While in Mexico to celebrate her 30th birthday on Thursday, Vanessa Minnillo flashed the giant engagement bling Nick Lachey gave her.

Vin Diesel is learning an important lesson in Rio de Janeiro this week -- in Brazil, even the sand sculptures wear thongs.

Not to be outdone by her "Fast Five" cast, Jordana Brewster cooled her smokin' hot bikini body at the beach in Rio on Thursday.

For the first time in months, Mel Gibson kinda, sorta, maybe cracked what may have been a smile last night ... as he drove out of his L.A. office building.

Fergie got cheeky in south Brazil yesterday with husband Josh Duhamel -- the same day Paul Walker, Vin Diesel, Ludacris, Tyrese and the rest of the "Fast and the Furious 5" cast hit the beach in Rio.

Sarah Palin is truly the most powerful person in the country ... not just because she led the Republican tidal wave last night ... but because she convinced her First Dude --Todd Palin -- to carry around her purse in public.

Although they say they are just friends, Chelsea Handler and 50 Cent enjoyed another public outing together at a restaurant in Malibu yesterday.

Blake Lively and Penn Badgley know breaking up is hard to do ... when you work together.