The songstress unveiled the new visual earlier this week and revealed that Jourdan had a starring role beside her as one of the dozens of partygoers.
Jessie, 25, uploaded the video and swiftly posted a fierce picture of herself sitting with the catwalk star on a sofa. She wrote: "#itsmyparty video OUT NOW! @officialjdunn looking smoking. Making me raise my posing game. I watch TV like this now!"
There's no denying that the two girls look incredible in the picture!
While Jessie is seen sporting a cut-out black one piece and black skinny jeans, Jourdan accentuates her killer long legs with a pair of a thigh high boots, some tiny shorts and a baggy black T-shirt.
Another photo from behind the scenes shows Jessie wearing a figure-flattering red knitted dress and no shoes. Well, your feet can tend to hurt after too much partying in heels!
The 'It's My Party' music video certainly lives up to the tittle of the song, as Jessie demonstrates her dancing skills and busts a move with a whole host of people.
The chart-topping singer explores various rooms off a corridor, which each contain a different group of trend-setters that she then parties with. It definitely looks like a lot of fun!
Since leaving her seat on The Voice UK, Jessie has been busy working on a tonne of new music and now she has even jetted out to Los Angeles to record with the likes of Mary J Blige and R&B legend Smokey Robinson.
Check out the video and let us know what you think below, as the best comment each week wins £50!