The One Direction hunk stopped by the supermodel and her husband Rande Gerber's abode in Malibu, California, to make ham and pineapple pizzas with her son Presley, 14, and 11-year-old daughter Kaia, but his secret stay was revealed when Presley posted a picture of their cooking session on Instagram.
In a message accompanying the image, he wrote: ''Thanks for stopping by the house again and helping the boys and I make our pizzas @harrystyles (sic)''
Harry was quick to respond to the teenager and promised to take Cindy's kids surfing next time he was in the area.
He wrote: ''Anytime brother.. See you for surfing soon. (sic)''
Presley replied: ''Looking forward to it @harrystyles (sic)''
It's not the first time the 19-year-old star has visited Cindy's house to see her children after popping over last month to see Presley after he had his tonsils out.
He wrote on Instagram: ''I was chilling at my house after I got my tonsils taken out and my sister had a friend over to hang.
''This guy knows how I feel.''
Last year, Harry and his One Direction bandmates - Niall Horan, Louis Tomlinson, Zayn Malik and Liam Payne - visited Johnny Depp's home recording studio to perform for the actor's 13-year-old daughter Lily-Rose.
But what about Jack White and Alicia Keys?
'Blackstar' swept the floor with five awards.
The artist landed three gongs at last night's ceremony.
The actor had a ‘torturous’ time filming the psychological horror movie.
Responding to what Ken Ehrlich and David Wild had to say about his 2013 Grammys performance, Ocean dismissed them as "old".
It's 1940 and World War II is in full swing. Allied soldiers from Britain, Belgium,...
Filmmaker Spurlock (Super Size Me) is known for his investigative wit, but there's none of...
British pop heartthrobs One Direction became a worldwide sensation when they were thrust together on...
Niall Horan, Zayn Malik, Liam Payne, Harry Styles and Louis Tomlinson may make up the...
They're the biggest boyband in the world since coming third in the seventh series of...