Ariana Grande: I’m anxious!

Ariana Grande is "excited" but "exhausted" for the first show of her tour.

The Problem singer kicks off The Honeymoon Tour on Wednesday night. And last minute preparations seem to have sent the star into a frenzy of emotions.

"already the longest day of my life. so much to get done still. anxious / nervous / excited / exhausted / ready / not ready! tomorrow!!!!???!(sic)" she wrote on Twitter on Tuesday. "how did it come so soon??!??¿ we're gonna be up all day and night finalizing this show for u. see u tomorrow kansas city loves.(sic)"

The 21-year-old will be supported by English boyband Rixton on the series of dates, which will take her across America and Canada before moving onto the European leg in May.

The shows are to promote her latest album, My Everything and Ariana can't wait to get in front of her fans.

It's been a busy few months for the beauty, having had number one singles on both sides of the Atlantic as well as getting to perform at the Grammy Salute to Stevie Wonder earlier this month.

And typically of Ariana, she kept her fans up to date on her thoughts and feelings via social networking.

"had the honor of singing one of my favorite songs in the world w the incredible @kennyedmonds today to honor the one and only Stevie Wonder!(sic)" she posted on Twitter after her performance. "thankful to even be in the same room as so many of the arists that performed today let alone share a stage w/ them!! & Stevie Wonder! (sic)"