Katie Waissel remained in The X Factor last night after a sing-off saw hot favourite Aiden Grimshaw booted off the show. However today, allegations surfaced that Waissel has released a track in the States, against X Factor rules.

Finding themselves in the bottom two last night, Aiden chose to sing Don’t Dream It’s Over by Crowded House in the sing-off, while Katie sang Christina Aguilera’s Save Me From Myself.

Simon Cowell and Cheryl Cole chose to keep Katie in the competition while Dannii Minogue and Louis Walsh voted to save Aiden.

The vote eventually went to deadlock, with Aiden receiving the least amount of votes from the public.

Aiden was gutted to be leaving the show, telling host Dermont O’Leary: “You win some, you lose some.”

Meanwhile, Katie was shocked at the public vote result, saying: “I’m really grateful people kept me in. I’m surprised – I’ve been in the bottom two a lot now.”

Is Katie Waissel’s breaking X Factor rules?

Today, The Sun is reporting that Katie has released a track in the States, going against X Factor regulations.

Waissel has previously attempted a career under the names Katie Vogel, Katie V and Katie Waissel. When she started out in the X Factor, Simon Cowell’s lawyers allegedly spent thousands of pounds removing her from a US record deal with Chamberlain Records.

However a track featuring Katie’s voice was released by the record company last week on an album by singer-songwriter David Reed.

Recording as Lola Fontaine, Katie sings with David on a song titled Moving Mountains.

A source told The Sun: “Katie is supposed to have severed all ties with Chamberlain – but it’s nonsense. She’s still in contact with them and they’re still releasing music by her.

“She might have hoped this would slip under the radar, but it’s a bit foolish.”

Katie may get away with it again though as an X Factor insider said: “As it’s simply a duet on another person’s album there is no reason it would affect Katie’s place in the show.”