Holly Willoughby looks completely different without trademark blonde hair in sweet snap with rarely seen sister

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Holly Willoughby celebrated her 41st birthday on Thursday and her rarely seen sister shared an adorable tribute.

And the This Morning presenter looks completely different with her trademark blonde hair.

Fans have been used to seeing Holly with the her bob haircut for years.

But she's not really a natural blonde and is hiding her brunette tresses.

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Taking to Instagram, Holly's sister Kelly shared a couple of throwback snaps of the TV star as a child celebrating her birthday, which falls on February 10.

"Happy birthday little sis," Kelly wrote alongside the image of them both with their hair in pigtails and ribbons and matching peter pan collar dresses.

"We might not be these kids anymore, but the dream is still the same. Here’s to love, adventure and cake!

"Have the best day @hollywilloughby Love you to bits."

Another photo showed a younger Holly in her highchair in front of table filled with party food and an impressive chocolate dog cake.

Holly replied to her older sister: "Love, adventure and cake… what a trio… love you Kelly."

The mum-of-three spent much of her special day hosting This Morning alongside Phillip Schofield.

And while it was a toned-down celebration compared to her 40th birthday last year, Holly was still showered with treats.

She shared a video to her Instagram story of what greeted her when she arrived in her dressing room at the ITV studios.

The little make-up air had been decorated with banners and multiple pink and silver balloons.

And as the show got underway on Thursday, Phil surprised Holly by crossing over live to the Brown's Hotel in London, who revealed where a cocktail had been created