'Partridge Family's Shirley Jones Appears Ageless in 90th Birthday Pic

Shirley Jones

Shirley Jones celebrated a milestone birthday in style and with her loved ones.

The Partridge Family matriarch turned 90 on Sunday, March 31, and she spent the big day alongside her family, as evidenced by a photo of the star posing with sons Shaun Cassidy, 65, Patrick Cassidy, 62, and Ryan Cassidy, 58, all of whom she shares with ex-husband Jack Cassidy.

"Happy 90th birthday to Miss Pittsburgh! What an incredible night," Shaun wrote in the caption of his recent Instagram upload, a nod to the Oscar winner's 1952 beauty pageant win.

The birthday girl put on her Sunday best for the occasion as she donned a sapphire blue bedazzled set outfitted with what appeared to be a martini broach. Other accessories included a sparkly tiara and a glittery gold sash that read, "90 and fabulous."

Her three sons stood beside her, all dressed nicely for the honorary event as they smiled big for the photo.

Fans were just as ecstatic to celebrate the TV star, taking to the comments with nothing but cheers and positive birthday wishes–taking the sitcom's theme song and the line "C'mon get happy!" very literally.

"What a sweet picture. She looks amazing! Is that a tiny martini pin on her jacket? ??," one eagle-eyed fan wrote.

Actress and model Cameron Richardson gleefully exclaimed, "She is looking as beautiful as ever. ??."

"Such a beautiful photo!" Canadian singer-songwriter Karen David gushed. "Happy Birthday to Queen Mama! ????????????."

Artist Bernie Taupin added, "Amazing she looks beyond legendary ????."

"?Happy Birthday Shirley! Looking so well with Mom Cassidy boys!" another fan wrote in part.

Happy birthday, Shirley!

Next: 7 Surprising Secrets of The Partridge Family Cast from Shirley Jones' Memoir