And here we thought they didn't get along! Zayn has apparently sent a letter of congrats to Louis on news that he's going to be a dad.
According to OK! Zayn told Louis what a great father he thought he'd be, and that he's proud to be his friend.
News broke earlier this week that Louis is expecting a child with an American woman named Briana who he'd been dating, after splitting up with longterm girlfriend Elanor Calder earlier this year.
Neither Louis nor Briana have commented.