Following a series of scientific tests, which included testing arm strength, bum firmness and ability to jump the furthest distance (see we told you it was scientific!) Harry came up trumps.
The boys were appearing on the new TV show Suck My Pop, which is hosted by Kimberley Walsh, who carried out the tests.
After poking their bums with her index finger the Girls Aloud singer revealed that the best member is officially Harry, while Tom came second, Danny third and Dougie came last after he failed every task. Aw, shame.