So, who do the boys want to work with next?
"Demi was a bit of a dream," said singer Brad Simpson.
Tristan Evans chimed in and added they'd love to get in the studio with Ed Sheeran next, and the rest of the band agreed!
The Vamps have also recently joined the Teens for Jeans campaign, which promotes clothing drives that collect gently-used denim for homeless young adults. Fifth Harmony, Chloe Grace Moretz, Demi Lovato, Rachel Bilson, Ashley Greene, and Chace Crawford are among the list of stars who have supported the campaign in the past.
"It's an incredible cause," Simpson shared with ETonline. "It's going to help millions of homeless teens across the US, Canada, and Mexico."
Guitarist James McVey jumped in and exclaimed, "Everyone's got jeans!" as the band encouraged teens to donate.
"We're donating our own jeans because it's so easy to get involved and help the millions of teens experiencing homelessness," Simpson added in a release about the effort.
Their album, Meet The Vamps, is out now -- and we thought what better way to MEET them, then by asking the cute fellas to share some fun quirks about themselves. Watch the video above to see what Brad, James, Tristan, and Connor all said, including lots of laughs -- and some silly tidbits about toes and peanut butter!
To celebrate their partnership with Teens For Jeans, Aéropostale and DoSomething.org, The Vamps are kicking things off with an acoustic performance for VIP fans and jean donation at the Times Square Aéropostale store.
Let us know who you want to see The Vamps collaborate with next! Send @Katie_Krause a tweet and include that hashtag #ETnow!