Reality TV star Kylie Jenner reportedly wants to become a singer because she has "realised that she can't compete with" her older sister Kendall when it comes to modelling.

The `Keeping Up with the Kardashians` star, who is rumoured to be dating `After Earth` actor Jaden Smith, has started taking vocal lessons, reports radaronline.com.

"Kylie has found her calling in life -- to be a singer! Kylie is now working on her first single! She is telling everyone that she knows she is going to be the next Katy Perry,` said a source.

The reality TV star is working with Jaden's sister Willow Smith's singing coach, Tim Carter, who is giving her private lessons at her mother Kris Jenner's house.

"She is in training right now with vocal coach and producer, Tim Carter. Kylie has a great voice,` said the source.