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Cheryl Cole’s attempt to patch things up with Simon Cowell appears to have gone awry after he was notably absent from her 30th birthday celebrations in Los Angeles this weekend.

The Girls Aloud singer and former X Factor judge threw a big bash to celebrate the milestone, and despite their differences he was on the guest list.

But according to the Mirror Simon did not attend, claiming he was ‘too busy’ to make it.

“She sent an invitation to Simon as she genuinely wanted him there,” a source told the paper.

“He’s been a big part of her life and, despite their falling out, she sees him as an old friend who she was very close to once.

The insider added: “ She has put all their differences aside and moved on in her life. “Unfortunately though Simon wasn’t able to make it.”

Simon and Cheryl first fell out after her short-lived tenure on The X Factor USA – which saw her dumped from the panel after just four days filming to be replaced by Nicole Scherzinger.

She later turned down an offer to return to the UK panel of the show – which Scherzinger later joined.