The reality star covered her growing baby bump in a pretty white blouse as she cuddled up to husband Kevin Jonas at the musical Cinderella at the Broadway Theatre in New York on Wednesday evening (18 September).
It appears the lucky birthday girl even got to act out her own Cinderella fantasy on stage after the show as she uploaded a picture to Instagram showing Kevin on a bended knee offering up a glass slipper to her. Loving the princess crown, too!
Danielle's parents joined her for the birthday day out. Her mum Angela tweeted earlier in the day: "Happy birthday to my beautiful daughter!"
Earlier in the night, Kevin treated his pregnant wife to a birthday dinner at Carmine's Italian restaurant. He tweeted: "Happy birthday to @daniellejonas my beautiful wife best friend and baby moma! I love you so much."
Their unborn child was also part of the festivities as Danielle told her Twitter followers the couple had been to the hospital for a scan that morning. She tweeted: "Got to see my baby girl at my doctor visit."
Clearly overwhelmed by birthday messages, she added: "Thank you for all the birthday wishes. Everyone has made me feel so special."
Danielle and Kevin announced back in July that they are expecting their first child together, then revealed the following month it will be a baby girl.
It's been a busy month for Jonas birthdays. On 16 September, Kevin's younger brother Nick celebrated his 21st with a lavish bash in Las Vegas.
Yesterday, Nick tweeted: "Happy birthday to my sister in law @daniellejonas hope it's a great one. Crazy to think next year we'll have a babygirl celebrating too!"
More celebrities with babies on the way in our gallery below!
Copyright: Vimeo / Weiss Eubanks