The couple, who are proud parents to son Rocket, were seen leaving the private members' club on Tuesday night (1 July), having earlier spent the evening hanging out with A-listers at the Serpentine Summer Party.
Model and fashion designer Helen wore a patterned dress teamed with a denim jacket and black ankle boots.
Meanwhile, Pharrell rocked a smart blazer jacket, ripped jeans and black trainers. And of course, another hat!
The 'Happy' hitmaker had earlier performed in front of the likes of Cara Delevingne, Keira Knightley, Nick Grimshaw and Naomi Campbell, at the glitzy party held at Hyde Park.
Ahead of his performance, Pharrell was also seen having an in-depth chat with Hollywood actor Bradley Cooper and his girlfriend Suki Waterhouse.
It's been quite a busy week for Pharrell, who jetted back over to Los Angeles for the BET Awards this weekend (29 June), where he scooped the 'Video of the Year' gong for his hit song 'Happy'.
During his acceptance speech, Pharrell gave a shout-out to Helen and Rocket, saying: "I'd just like to take a second also to thank my mum, my dad, my wife, my son."
Pharrell is now gearing up to perform at this year's Wireless Festival, which is taking place in both London and Birmingham this weekend!
Newly appointed Voice US judge Pharrell will be making another trip back to the UK later this year, as he kicks off his 'Dear G I R L' European tour. Pharrell will be performing two UK dates, heading to Manchester on 9 September and London on 9 October.
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Watch Pharrell's video for 'Marilyn Monroe' below: