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OTRC: Britney Spears shows off bikini body in Hawaiian vacation pics

Britney Spears, Jason Trawick and the singer's sons Sean Preston and Jayden James appear in photos from their vacation in Hawaii, posted on Spears' official Twitter profile on July 4 and July 5, 2012. (pic.twitter.com/uqZWEpgO / http://pic.twitter.com/SwFhSwm4)

Britney Spears showed off her bikini body in a photo from her family vacation in Hawaii.

Spears, who has been relaxing with her fiance Jason Trawick and sons in Hawaii, celebrated the Fourth of July in the Aloha state and shared two photos with fans on Twitter - a family portrait and a photo of the slimmed-down singer in a purple bikini.

In the Independence Day family portrait, Trawick has his arm around Spears, who is shown smiling above her sons from her marriage to Kevin Federline - 5-year-old Jayden James and 6-year-old Sean Preston. The whole family is shown wearing traditional Leis around their necks.

The 30-year-old singer also shared a toned and tan bikini photo and wrote in the caption, "Getting ready for some pool time! Having a blast."

Spears has been busy filming the upcoming second season of FOX's "The X Factor." It was announced on May 14 that Spears and Demi Lovato would join Simon Cowell and L.A. Reid on the reality singing competition's judging panel, replacing Paula Abdul and Nicole Scherzinger, who left the show in January.

A wedding date has not been announced for Spears and Trawick, who became engaged on December 15. Trawick and Spears have been dating since the summer of 2009. Prior to that, the two had a professional relationship as Trawick was Spears' manager. The two ended their professional ties in May 2010 to "focus on their personal relationship."

In April, Trawick became Spears' co-conservator alongside the pop star's father Jamie Spears. As conservators Trawick and Jamie Spears have control over several decision-making aspects of Spears' personal life but not in managing her assets.

Spears has been under the conservatorship of her father, Jamie Spears since February 2008, when she suffered a meltdown that that saw her shaving her own head at a salon (watch video). The conservatorship can be lifted once a judge and Spears' doctors agree that the singer can manage her own affairs.

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