Harry Styles Says Ex Taylor Swift's Sexy Brit Awards Performance Was "Great"

USMagazine, Thursday, February 21, 2013, 6:00am (PST)

Taylor Swift showed ex-boyfriend Harry Styles exactly what he's missing onstage at London's 02 Arena at the Brit Awards on Wednesday (Feb. 20). Performing break-up anthem "I Knew You Were Trouble" for Britain's biggest music show, the 23-year-old began the rocking set in a white, wedding-style dress -- only to rip off the gown mid-song to reveal a skimpy, sexy black catsuit with bustier-style top plus flirty, gold-tipped boots.

PHOTOS: Taylor's romantic history

Styles, 19, was also on hand for the big show with his One Direction bandmates, and was seen smiling in the audience during his former girlfriend's performance. Afterward, Styles had nothing but plaudits for his Swift's hot makeover. "Great!" Styles told Us Weekly of the performance during the Sony and Belvedere after party at the Art's Club on Dover Street. "She always puts on a good show."

PHOTOS: Taylor's best surprised faces

The Brit's date for that afterparty? His mom! According to a source, Styles continued the celebrations at the Warner Brits afterparty at the Savoy Hotel, where he whupped it up with best pal Nick Grimshaw -- and without his One Direction pals.

PHOTOS: Squeal! Cutest boy bands of all time

"He was only there for about 30 minutes but he spent time chatting with a bunch of girls I don't think he knew," says an onlooker of the Warner bash, where Kate Hudson and her fiance Matt Bellamy of Muse also held court. "He was drinking one of the cocktails -- he was just his cheery self. He's got great hair!"

This article originally appeared on Usmagazine.com: Harry Styles Says Ex Taylor Swift's Sexy Brit Awards Performance Was "Great"