We recently caught up with YouTube sensations (and adorable twin sisters) Megan and Liz, and the girls couldn't stop gushing about their new song, "Release You." 

Their first bouncy new single was produced by Shellback, who's a super huge deal in the pop music world. He's worked with the likes of Britney Spears, Pink and Ke$ha, and Megan and Liz were a little intimidated. But only at first: "You know, [Shellback] does have all these names on his roster... But he's a great guy, and the whole team is so nice and talented. It went really well." 

Check out more in our interview with Megan and Liz above, and see what's in their luggage below.