Britney Spears is pregnant, the 40-year-old pop star announced on Instagram Monday.

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Spears wrote in her post that shortly after a trip to Maui with her fiancé, Sam Asghari, she started to gain weight.

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She wrote, "So I got a pregnancy test ... and uhhhhh well ... I am having a baby."

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The news of the pop star's pregnancy comes months after a judge ended her 13-year conservatorship

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after a highly publicized legal battle with Spears' father. This arrangement meant

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Spears had very limited control over her life and the decisions she could make — including on her career, finances and health.

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The singer was placed under her conservatorship in 2008 after suffering from mental health issues.

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In a bombshell testimony last June, she told a Los Angeles Superior Court judge that she wanted to have another baby,

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but she was forced to keep an IUD in place, in accordance with her conservatorship.

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Spears is already a mom to two boys: Sean Preston Federline, 16, and Jayden James Federline, 15,

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