'Even when you get married you have to keep dating,' These famous couples have shared the secret to their happy relationships...

Tom Holland recently gushed about how he loves how his sweetheart and 'Spider-Man' co-star Zendaya is always so “honest with” him The 27-year-old actor - who first met the actress on set in 2016 - said: "Zendaya is probably the most honest with me. Which I love, ‘cause you need that." But what is the secret to the happiness of other famous couples? Read on to find out...