Heading to the capital's Ham Yard Hotel, Hannah and Jon couldn't have looked happier as they cuddled up together before heading inside for the screening of Simon Pegg's new movie Absolutely Anything.
Inside the venue they rubbed shoulders with Made In Chelsea's Louise Thompson, her younger brother Sam and Tiffany Watson, before joining Casey Batchelor and TOWIE stars Lewis Bloor and Dan Edgar for a few drinks.
Sounds like they had a fun night, right?
For their showbiz night out together, Jon and Hannah made sure to dress up for the occasion. While the Essex boy cut a suave figure in a printed shirt and fitted trousers, model Hannah looked gorgeous in a floor-length cobalt blue dress.
She teamed her getup with perfectly blow-dried locks and a shimmery nude-hued lipstick on her lips, finishing off her look with the ultimate accessory, her engagement ring.
Last month, Jon proposed to Hannah while the pair were starring on Love Island and despite having only dated for six weeks, she happily said yes.
The couple went on to finish second on the show and since returning home from Majorca, Hannah and Jon have been celebrating their engagement.
Hannah has been giving us all a good look at her new diamond sparkler too.
Sharing a selfie over the weekend, the reality star quoted her boyfriend and his famous 'unicorn line' alongside her photo. She said: "you make me feel like a unicorn @jbclark_"
Jon has also been known to gush about Hannah on social media too. He recently told fans he was "one lucky guy" to be marrying the woman of his dreams.
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