Victoria Beckham looks completely different in a throwback snap dressed as a bunny.

The Spice Girls star, 46, logged into her Instagram account on Saturday to pay tribute to her younger sister Louise on her birthday.

After searching through the family photo albums, the businesswomen found an adorable snap of her and Louise posing for a snap together from back in their younger days.

Clearly getting ready for some sort of occasion, Victoria and youngster sibling looked ready for the event with Louise dressed as Alice In Wonderland and Victoria dressed as the White Rabbit.

The fashion designer's skintight costume showed off her model pins as she donned a white leotard with a pair of pale tights and ballet shoes.

Victoria Beckham logged into her Instagram account on Saturday to pay tribute to her younger sister Louise on her birthday

The mother of four completed her look with a white bow tie and some matching gloves and held her long dark lock back from her face with some bunny ears.

VB tagged mum Jackie in the snap shared on her Instagram stories in view of her 288 million followers.

She penned: "@jackie.adams maybe you can explain?".

Victoria recently mocked her husband David for his glistening white teeth on a personalised chocolate calendar.

The pop star took to her Instagram stories on Saturday to share a video of a advent calendar featuring herself and her family that was gifted to her by a fan.

The Spice Girls singer looks unrecognisable in the bunny costume

However, the fashion designer couldn't help but laugh at the former footballer's incredibly shiny white teeth in the photo, zooming into his face as she teased that he must be "wearing them in".

In the hilarious video, she could be heard joking: "So today I received this incredible advent calendar that was sent to me.

"Just pointing out, how amazing are David's teeth? Umm..."

And alongside the post, she also ribbed her husband, 45, penning: "I mean.. is @davidbeckham wearing these teeth in for someone else?!?"

The unique advent calendar was personalised with a snap of the Beckham clan outside their Cotswolds home.

Victoria went on to praise long-time fan Kevin for the "incredible" gift, which came alongside a "touching" letter that left her feeling rather emotional.

She thanked the fan, saying: "But this is a personalised chocolate advent calendar and it was given to me by Kevin, who is a Spice Girls fan, a fan for 25 years.

"And he has written the most incredible letter that's really touched me actually.

"We really do have the most wonderful Spice Girls fans. I feel so blessed and so lucky and I love this."

"Thank you so much Kevin – and once again, check out my husband's teeth."