Nicole Scherzinger fans can’t believe her age as newly-engaged star celebrates her birthday

NICOLE Scherzinger fans "can't believe" her age as she celebrates her 45th birthday.

The former Pussycat Dolls star took to Instagram on Thursday and shared a carousel of snaps in a reel from her birthdays over the years.

Captioning the clip, Nicole wrote: " Happy Birthday little Nicole. You were always such a good little girl, with the sweetest heart, and the biggest dreams.

"Now you're grown and I am very proud of how far you've come and are still becoming.

"Here's to another year around the sun, another year of never giving up, another year of following your heart's whispers."

Fans and friends flocked to her comment section shocked at her age.

Her cousin Stephen commented: "45? cuz @nicolescherzinger still looks 25!! happy birthday cuz have a great one."

Somebody else added: "Can't believe you're 45??"

"You're a timeless beauty," another wrote.

It comes after the singer revealed her engagement to boyfriend Thom Evans.

She shared the incredible news in a sweet post to her 5.8 million fans on Instagram.

Nicole captioned two photos of their special moment: "I said yes."

Thom also celebrated the relationship milestone on Instagram, writing, "My Ever After."

The pair first met when Thom appeared as a contestant on the celebrity edition of the ITV talent contest The X Factor.

Shortly after, Nicole was left smitten with the Scottish rugby union player and a romance quickly developed.