That is what British mother-of-two Anita Rydzinsi decided to do for her husband’s upcoming 50th birthday.

It’d be hard to guess who was more surprised when the life-sized cast of her bottom, complete with suspenders and tiny thong, was unwrapped: her husband, or her 13-year-old son. 

The celebrity fan base of this pricey and steadily growing in popularity activity (a whole body cast could set you back $15,000) already includes the Beckhams, Sir Elton John, Helena-Bonham-Carter, Amanda Holden and Myleene Klass.

Check out the bronze bottom (and its owner) by clicking here.

Image: Getty