One: Stella

Stella Morgan, Roslyn Steel, Ciarra Green, and Sienna Grey are best friends who decided to join a band together called the heartbreakers.

With Ciarra and Stella on the guitar, Roslyn on the bass and Sienna on the drums, the foursome can really rock.

And that's what grabs 5sos's attention besides their looks, and asks the girls to join them on tour.

Read on to find out what happens on the tour.