Britney Spears, 40, took to Instagram Tuesday evening with multiple posts, one in which she wished both her sons a happy birthday, the other in which she wept as she danced.

She shared an image of herself posing between her two sons (with ex-husband Kevin Federline, 44), who celebrate their birthdays this week. Jayden turned 16 on Monday, while Preston turns 17 on Wednesday

On Tuesday, Toxic posted a clip in which she danced, breaking into tears in a long-overdue moment of release.

She showed off her dance moves in an emotional clip wearing a white crop top and black shorts.

Spears is on a roll professionally, as her new single with Elton John, Hold Me Closer, debuted at number six on the Billboard Hot 100, marking her first new music for years. The singer said: 'It's been a while since I cried on camera!!!'