The X Factor judge was joined by fellow judges Sharon Osbourne and Louis Walsh at the swanky Dorchester Hotel in London after a long day of auditions at Wembley arena.
Nicole looked gorgeous, turning heads in a figure-hugging, bright orange PVC mini dress from Bally of Switzerland. The 'Boomerang' singer also showed off her svelte figure and long tanned legs with some red killer heels.
Fellow judge Gary Barlow was missing from the after-work celebrations but it didn't stop the trio from having a good time as they flashed smiles at photographers.
Showing off their close bond, Nicole strung her arm around Sharon while Louis was laughing behind them.
Their joyous celebrations continued outside as they were waiting for taxis, and Sharon whipped off her red Manolo Blahnik heels and started using them as a telephone!
The 60-year-old, who returned back to the X Factor this year after leaving the talent show in 2008, held up her heels to Louis' ear before having a go of it herself.
Nicole looked to be in good spirits but it was reported this week that the US pop star was feeling "lonely" following her split from Formula One driving ace Lewis.
The couple - who had been dating for five years - went their separate ways last month, reportedly due to hectic work schedules.
Taking to Twitter this week, she told her followers: "From my HEART-Thanku so much to all my fans 4 sending ur words of wisdom & faith, love & inspiration right now..God Bless u, I love u xo."
Can you remember all the X Factor winners? Remind yourself with our gallery below!
Copyright: WENN Harsha Gopal