T-ARA N4 has moved their schedule up a bit and is flying out to the U.S. on May 23.

T-ARA N4 was originally supposed to leave on May 25 to L.A. in order to open for Chris Brown's solo concert in Las Vegas on May 26.

T-ARA N4 Attends Press Conference Regarding U.S. Activities and Promotions - May 20, 2013 [PHOTOS] 

However, they recently received another love call from hip hop star Wiz Khalifa, who asked them to open his concert as well. T-ARA N4 has canceled all activities for this week and is heading out to the states tomorrow for Wiz Khalifa's concert on May 24.

For this performance, Wiz Khalifa will also be performing with them for their "Countryside Diary" performance.

Wiz Khalifa is known for his featurings in Maroon 5 and has also won awards at the 2011 BET Awards and 2012 Billboard Music Awards.

T-ARA N4 plans to leave tomorrow to L.A. and practice for Wiz Khalifa's show on May 24 and 26 and continue on to Chris Brown's concert.

An official commented that the group was very nervous as this would be their first time to perform their new song in the U.S.

T-ARA N4 will be performing with Chris Brown on May 26 in Las Vegas. T-ARA N4 will not be opening for the concert but rather be appearing as a surprise guest in the middle of his show. They will be performing a newly edited version of  "Countryside Diary" with Chris Brown.