Taking to the red carpet outside of Leicester Square's Odeon, Simon and Lauren were pictured holding hands as they made their way inside the star-studded affair.
Of course, Simon was sporting his usual attire of an open-buttoned white shirt and shades, ditching his usual jeans for a smarter option of black suit trousers.
On his arm, his partner Lauren cut a very glamorous figure, flashing her ankle tattoo as she bared her legs in a fitted royal blue dress. She teamed her frock with black stiletto heels and a matching black clutch, sporting her brunette locks in loose curls.
The couple - who are parents to their one-year-old son Eric - looked perfectly at ease with each other as they shared a joke while posing for waiting photographers.
Inside the ceremony, Simon and Lauren were joined by a slew of famous faces including pregnant Radio 1 DJ Fearne Cotton, former TOWIE star Sam Faiers and former X Factor star Ella Henderson.
The music mogul was also reunited with BGT hosts Ant Mc Partlin and Declan Donnelly.
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