Britney Spears' sister is hoping to follow in the Toxic singer's footsteps by conquering the music charts with her first-ever single.

Jamie Lynn Spears, 22, released How Could I Want More on Monday (25Nov13) and the track is already a hit on iTunes.

She took to Instagram.com to share her excitement with fans, writing, "Surprise!!!!!! On itunes now!!!! Go get it- Right Now!!!!! This song means a lot to me... Hope it does to ya'll (sic) as well!! Love y'all!!"

The young mum has also teamed up with her famous sister to record a track for Britney's new album, Britney Jean, which is set for release on 3 December (13).

Jamie first started recording songs for her debut country album in 2009, and, in 2011, she showcased a few tracks during a performance in Nashville, Tennessee.