Justin Bieber Opening Act Jessica Jarrell 'Excited' To Tour

'It's overwhelming, but a lot of fun to look out and see all of those girls screaming,' the 15-year-old says of opening for Bieber.

HARTFORD, Connecticut — It may be [artist id="3187077"]Justin Bieber[/artist]'s world, but tourmate [artist id="3187075"]Jessica Jarrell[/artist] seems determined to prove she deserves a place in the pop universe. The 15-year-old Mercury Records singer is opening up for Bieber this summer on his much-anticipated My World Tour.

And while Bieber admitted to some pre-tour jitters on Twitter, Jarrell was already sounding like an old pro, saying she had a "rush" before the kickoff show on Wednesday in Hartford, Connecticut, at the XL Center.

"I was a little nervous earlier. I was like, 'Oh my God! There's going to be so many people,' but you know I'm really excited," she told MTV News when we caught up with her on her tour bus. "It's overwhelming but it's a lot of fun to be able to look out and see all of those girls screaming. It's just crazy! You get an adrenaline rush!"

In the moments leading up to the show, Jarrell said she hadn't spoken to Bieber that day, but guessed what he might be feeling. "I haven't talked to him today! I'm sure he's good," she said. "I'm sure he's excited."

In addition to opening for Bieber (Sean Kingston is also on the bill), Jarrell also makes an appearance during Justin's set to perform their duet, "Overboard."

"I come out during his set and there's a bunch of fog on the stairs," she teased. "It's going to be really cool. I'm excited about that song. It's a lot of fun. We goof off and have a great time. We rehearsed it [Tuesday]; we had a really good time. It sounds great to be in an arena. It all sounds really good, the whole show, the lighting, everything."

Will you see Justin Bieber on tour this summer? Let us know in the comments!