Kylie and Kendall Jenner.

Did X Factor USA finalist Emblem3 turn down a request to play Kim, Khloe and Kourtney Kardashians younger half-sister Kendall Jenner's birthday party?

A report claims the hot young band was unable to perform for the reality TV star and aspiring model, but it was nothing personal, it was a scheduling conflict.

They are kind of busy with the competition getting very heated with the final eight acts remaining on the X Factor USA.

The ‘Keeping Up With The Kardashians’ star celebrated her 17th birthday with a lavish party earlier this month and although she tried to get the boy band to serenade her guests, they refused due to their hectic schedules.

According to gossip website TMZ, Kendall’s mother Kris Jenner tired to hire Drew Chadwick, Keaton Stromberg and Wesley Stromberg for the big day and even though Kendall’s sister Khloe Kardashian hosts the ‘X Factor’, the family couldn’t convince them to take time out of their hectic schedule.

Along with her party in Los Angeles, Kendall also celebrated her 17th birthday with a helicopter ride in Australia.

The showbiz prodigy - who last year received a Range Rover for her birthday - was given the special treat by her parents Kris and Bruce Jenner while she was in the country working on a photo shoot for Miss Teen Vogue.

Kendall was even allowed to pick which aircraft she wanted to go in when Kris took her to an airfield November 3, the date of her birthday.

She then celebrated by ordering the pilot to take her to some remote locations in the Australian outback.

(Image: WENN)