Taking to Instagram, the 'Toxic" singer shared a series of photos that showed her enjoying her big day with her family, including her sons Sean and Jayden.

One pic also featured Britney's name spelled out in big silver balloons, which came courtesy of Miley Cyrus. 'Had the CUTEST surprise party today!!!" Spears wrote. 'A special thank you to Miss @MileyCyrus for sending these awesome balloons!" See the post - here.

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