But she’s probably celebrating with cake rather than champagne, now she’s happily settled with boyfriend Jason Trawick and rumoured to be discussing marriage and babies.
The pop star has come a long way from her big break in 1992, in the popular Mickey Mouse Club, alongside Christina Aguilera and Justin Timberlake, aged 11.
She soon signed to Jive records and released her debut number one hit, Baby One More Time.
Now the mum of two has seven albums, five world tours and a public meltdown under her belt.
Since she lost custody of her sons and went into rehab after the head-shaving and car-attacking breakdown, she has made a decent comeback.
You can’t say Brit’s life’s been uneventful: she dated Justin Timberlake, she’s snogged Madonna, won a Grammy and made millions.
An insider recently said the singer was keen to get married and have another baby.
The source said: “Britney really wants to get married and have another baby.”
And added that Britney and Trawick, who used to be her agent, have been “talking about marriage for a long time.”