Louis Tomlinson and Zayn Malik arranged a little prank for their One Direction band mates...

It's part of their appearance on Nickelodeon's new show You Gotta See This. The guys chose to play a pretty big joke on their guys.

With the help of an actress playing their producer, they tricked Harry, Liam, and Niall into thinking they had to help Stephanie give birth.

Check out the video below – their reaction are hilarious!

Also, a very happy second birthday to One Direction. The guys officially formed on July 23rd, 2010. They've come so far in just two years! 

Thanks to Wambie girls Monika and Sonya for sending this in, and especially Ana, who let us know it was their birthday too.

Source: Beautiful Ballad