Although Kylie, 15, showed off her long legs in a short, leopard print dress, it was Jaden who stole the spotlight, wearing what appeared to be Iron Man pajamas and a mask.
Why? We may never know, but the mask certainly didn't make the "After Earth" star any less conspicuous.
Then again, subtlety was never Tony Stark's thing.
Swim Week Miami Beach 2014 [PHOTOS]