Stuart C. Wilson / Getty Images North America 1 / 3
Stuart C. Wilson / Getty Images North America 1 / 3

He's got skin in the game! Pippa Middleton's future brother-in-law stripped down to nearly nothing for a racy promotion with two topless women in London.

Oh, what would the palace say!

Spencer Matthews, the younger brother of Pippa's fiancé, James Matthews, posed in his underwear in a storefront window during London Fashion Week.

The Daily Mail reported that he posed for Lyst, a high-fashion ecommerce website, that was promoting its "augmented reality dressing experience." It allowed users to dress the future royal-adjacent and other scantily-clad models in outfits of their choosing from their tablets or smartphones.

Clearly, Pippa's future family member isn't shy. Spencer once starred on the U.K.'s version of "The Bachelor" in 2012.

At the end of the show, he chose Khloe Evans, a blond beauty, but the two broke things off just a few days later after she was allegedly seen kissing another reality star, "The Only Way Is Essex" star Tom Pearce.

James' brother has a thing for being in front of the reality TV cameras. In 2011, he appeared in the docuseries "Made In Chelsea," a show inspired by "The Hills" and featured recurring appearances by Stephanie Pratt, Spencer Pratt's sister. Pippa's future family member left the show last year.

In 2015, he also appeared on "I'm a Celebrity … Get Me Out of Here!" and often appeared on "Loose Women," a daytime talk show.

Spencer's fame likely won't bother Pippa, as she knows all about being in the public eye as the sister of Duchess Kate, who is married to Prince William.

"The Duke and Duchess of Cambridge are absolutely delighted with the news," a statement from Kensington Palace as news of Pippa's engagement was confirmed. Pippa was reportedly totally surprised by the proposal, as was her sister Kate, who reportedly knew nothing in advance.

After Pippa says "I do," likely in 2017, Spencer will rub shoulders with royalty, something he says he's already done.

"I went to Eton with Prince Harry, he was a year above me," Spencer said told the Radio Times in 2012. "I know Princesses Eugenie and Beatrice really well, too. Bea's boyfriend Dave Clark is a very good friend of mine."