POTW: Demi Lovato, Usher, Taylor Momsen, T.I.

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Demi Lovato makes a wish and blows out the candles on the cake during her 18th birthday party at Buddakan in NYC on Aug. 19.

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It’s a Disney affair at the “Camp Rock 2: The Final Jam” premiere when Mickey and Minnie Mouse pose with the Jonas Brothers and their little brother Frankie Jonas in NYC on Aug. 18.

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Usher strikes a pose at his performance on “Good Morning America” in Central Park in NYC on Aug. 20.

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Katy Perry gets chased through the Narita International Airport by luggage on Aug. 15 in Narita, Japan.

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Madonna is the picture of elegance as she steps out of her car to attend her 52nd birthday party at the Shoreditch House in London on Aug. 14.

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Bow Wow gets behind the register to promote his new film “Lottery Ticket” at Foot Locker in Herald Square in NYC on Aug. 16.

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T.I. salutes the crowd with Mary J. Blige during the launch of the AXE Music “One Night Only” concert series in NYC on Aug. 16.

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Hayley Williams gets awestruck during a Paramore performance at the Charter One Pavillion in Chicago on Aug. 18.

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Charice belts it out for a performance at “Nickelodeon’s Big Time Rush and Victoria Justice Celebrate Back To School” show at the Macy’s at Herald Square in NYC on Aug. 15.

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Taylor Momsen from The Pretty Reckless and hit TV show “Gossip Girl” sings her heart out for the crowd at the O2 Academy Islington in London on Aug. 19.

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Janelle Monáe appears to be the Caped Crusader while performing in San Francisco on Aug. 15 at the 2010 Outside Lands festival.

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Samantha Ronson turns up the volume at her DJ set at Greenhouse in NYC on Aug. 19.

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Big Boi and producer Scott Storch offer a thumbs up after Big Boi’s Sobe Live free show in Miami on Aug. 18.

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Kristian Bush from Sugarland gets knocked out by Jennifer Nettles‘ singing skills at Freedom Hall in Louisville, Kentucky on Aug. 19.

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Actress Bai Ling was magnetized to the hardware on Justin Tranter’s jacket as the Semi Precious Weapons singer performs at Studio 54 on Aug. 14 in Las Vegas.

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Edward Sharpe & the Magnetic Zeros lead the crowd into a trance at the 2010 Outside Lands festival on Aug. 15 in San Francisco.

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Weezer‘s front man Rivers Cuomo inspects sombrero of his paper mache friend during Day 2 of the Mile High Festival in Commerce City, Colo. on Aug. 15.

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Jason Derulo rocks a keytar on stage at Shepherds Bush Empire in London on Aug. 19.

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Damian “Jr. Gong” Marley gives quite a “dread”-ful performance on Aug. 15 at the 2010 Outside Lands festival in San Francisco.

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Jordin Sparks takes a bow after her Broadway debut in “In The Heights” at the Richard Rodgers Theatre in NYC on Aug. 19.

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Sealgoes drag behind the scenes of “Priscilla” at the Palace Theatre in London on Aug. 19.