09/10/2013 06:27 BST

Simon Cowell's Ex, Terri Seymour, Sits On His Lap As They Share Car Home After His Birthday Celebrations (PICTURES)

We have a feeling Simon Cowell will be in the doghouse with his baby mama Lauren Silverman when she sees these pics of his ex, Terri Seymour, sat on his lap in the back of a car after a night out. And judging by Si's reaction, he knows he will be too!

The pair - who previously dated for six years before splitting in 2008 - were snapped getting cosy in the back of a car after celebrating his 54th birthday with a meal at Sur in West Hollywood on Monday night.

simon cowell

Simon Cowell and Terri Seymour

Simon - who to set to become a father in just a few months with Lauren - looked to be embarrassed as the TV presenter perched her behind on his knee, covering his face with his hands.

simon cowell

Simon looked as if he knew he was in trouble as Terri sat on his knee

The pair had earlier been joined at dinner by Simon's former 'American Idol' co-judge Randy Jackson, along with a mystery blonde woman.

Simon later took to Twitter to thank fans for their birthday wishes, while also inviting Sinead O'Connor to come on 'The X Factor', after she slated the music mogul and his TV show for 'murdering music' in a recent interview.

"I think sinead o'connor would be a real fun guest judge on X factor. She loves the show and everything I do. Let me know sinead," he tweeted.

"And I had a great birthday yesterday. Thanks again for all of your tweets," he added.


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