The former Hollyoaks star looked beautiful in her monochrome ensemble as she headed out with girlfriends in the capital on 3 August.
It's no surprise Gemma looked so great when she's known for her dedication to working out… even if she was worried last week about getting back into training after her holiday.
She tweeted on 30 July: "1st session back training with @Olly_Foster 2day. Considering Im coming off the back of a 2wk Hol & a w'end on the lash I'm quite scared!"
Gemma, 28, was among the guests at a party to celebrate the launch of UFC on BT Sport.
Earlier this year, the actress revealed she'd become engaged in secret to boyfriend Liam Richards last year. In April she tweeted: "Ok, to those asking, yes, I am engaged. I have been since Aug. We celebrated privately last year with fam and friends."
After being inundated with messages of congratulations, the said: "Thanks for all the lovely messages. You are all too kind. Enjoy the rest of the day. I'm having a lazy one. Food, films, dog, duvet #perfect."
Since leaving Hollyoaks Gemma has starred in shows including Casualty andLaw & Order: UK, as well as showing off her incredible bikini body on I'm A Celebrity… Get Me Out Of Here!
More engaged stars in our gallery below:
Copyright: Instagram Mark Wright