Having headed back home after her recent stint Stateside, there was no rest for the wicked as Jessie set about promoting her new track 'Bang Bang' that features US superstars Ariana Grande and Nicki Minaj.
Sleekly dressed for her day in the capital, Jessie wore a stylish monochrome ensemble - brightened up by her famous pout of course!
The singer opted for a chic yet casual outfit choice, teaming a long-sleeved white crop top with black skinny jeans and a collarless black jacket.
On her feet, Jessie wore a very cool pair of black, white and tan colour layered creepers.
Adding some sass to her outfit, the 'Wild' singer slicked her hair back from her face in a low ponytail and brightened up her ensemble with a large red tote bag and a bold, but glamorous rouge pout.
And after her new track reached the top 10 in the US, it's no doubt Jessie headed into Kiss FM in the hope to emulate her new track's success here in the UK.
Last week Jessie tweeted: "Ahhhhhhh #6 officially in AMERICA on billboard! Thank you for filling my heart with love support and belief! I love music so much and this is the most amazing time ever! #BANGBANG."
'Bang Bang' was released on iTunes at the end of July and while we're all waiting eagerly to see the music video, Jessie teased her followers on Instagram to a taster as she posed on set for a selfie with Ariana and Nicki.
And with the power trio looking like the glam superstars they are, we're sure it won't disappoint!
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Listen to Jessie, Ariana and Nicki's new track 'Bang Bang' here: