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Miley Cyrus Gets Cozy With Costar BF After Concert

Wed., Sep. 23, 2009 9:58 AM PDT by Cristina Gibson

Bret Thompsett/PacificCoastNews.com

It looks like Miley Cyrus' on-set romance with her Last Song costar Liam Hemsworth wasn't just a summer fling.

The Australian hottie was in the audience for Miley's sold-out show at the Staples Center last night, and he wasn't just there as a fan like Ashley Tisdale and Miranda Cosgrove.

According to a source, Liam is officially her boyfriend and the couple have been dating for five months.

And being the saavy marketer she is, Miley's already found a way to incorporate her new man into her show...

Before she performed a song from their movie, Miley gushed about how life really can imitate art as a makeout montage of them played behind her.

The twosome didn't try to hide their affection later at her private after-party at Katsuya, where they were "lovey-dovey."

As for her ex-boyfriend and underwear model extraordinaire Justin Gaston, he was busy watching another girl work the crowd across town.

Miley's best friend, Mandy Jiroux, was performing with her group The Beach Girl5 at Upper Manhattan, and Justin was in the audience.

When asked why he chose Mandy's concert over his ex's, Justin told E! News he "didn't even know Miley's tour was in town."

Whatever you say, Justin. We're giving props to Miley for upgrading to another hottie with an Aussie accent and actual career. Well played, Miley, well played.

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One thing missing from her concert last night? The stripper pole used during the Teen Choice Awards performance. Find out why!