The Crazy Stupid Love singer told talk show host Graham Norton she is settling back into her role on the talent show, but admitted there were some testing moments with the Irish judge.The pair have famously feuded in the past and in Friday's Graham Norton Show, she says: "It's a little bit frosty."Asked by Norton whether things are "off" between them, she responds: "They were never on."Cole has been away from X Factor since 2010 after boss Simon Cowell famously dropped her from the US version of the show.The pair fell out as a result of Cowell's decision, but they have now patched things up.Cole said: "There was a lot of grovelling to get me back once Simon was on board."But she added: "It feels like I've never been away".During the interview, Cole revealed the tattoo on her bottom cost her as much as the price of a car.The former Girls Aloud singer caused a media stir last year when tattoo artist Nikko Hurtado posted a snap of the design, which showed her entire lower back and bottom covered with roses, on his Instagram page.Cole explained how the body art was a reaction to contracting malaria in 2010, which had made her compile a list of things she wanted to do."Life's too short and the tattoo was on the list," she said.Cole said of the cost: "It was in the thousands, probably the cost of a small car. He's an exceptional artist and he was worth it."