Spears To Wed Trawick

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December 16, 2011 | 2:15pm EST

Britney Spears is planning her third wedding after accepting longtime boyfriend and former agent Jason Trawick’s proposal on Thursday night, while the couple was celebrating his 40th birthday.

A source tells Us Weekly magazine, “This is something they’ve both wanted for a long time.”

Trawick and Spears are planning to celebrate the big news with family and friends on Friday night at Planet Hollywood in Las Vegas, according to the publication.

And Spears appears to have confirmed the news in a Friday morning tweet, writing: “OMG. Last night Jason surprised me with the one gift I’ve been waiting for. Can’t wait to show you! SO SO SO excited!!!!”

The couple met in 2006 when Trawick began representing Spears while she was still married to Kevin Federline. They became an item in 2009.

Spears has been married twice before – to Jason Alexander and Federline. Her marriage to Alexander lasted just 55 hours and she divorced Federline in 2007.