The pair looked close at they partied at the bash at Nylon in London.
Lauren, 24, posted numerous snaps of her with the mum-of-three on Twitter and wrote: “Me and @MissKatiePrice been party allll night long 2 many kisses from her 2night just got in cab x x x”
She attended the party with her TOWIE pal Lauren Pope, who is good friends with Katie, 33.
And Lauren, who broke up with former fiancé Mark nearly two weeks ago, seemed to be enjoying going out on the town as a single girl.
She showed off her curves in a low-cut blue frock for the party.
The next day her kissing partner Katie admitted she had over done the booze, Tweeting: “Omg biggest hangover ever its been ALONG time since I’ve had a night out drinking and boy do I feel it! happy birthday leo hahaha (sic)”
Meanwhile, Mark, 24, opened up about their split over the weekend, saying he had ended the engagement because their sex life dried up.
Explaining how they hadn’t slept together for nearly two months before their break up, he told a newspaper: “As soon as our sex life started to fizzle, I knew that if we didn’t have the sex we might as well call it a day.”
He also said he believed that Lauren had cheated on him while he was on holiday in Marbella, which she denies.
He added: “Loads of my friends were in the club that night. I came out of a meeting and I had seven missed calls. I knew something had gone on. I went out to the pool and I just cried.”
But Mark – who said he still found Lauren beautiful – said he missed their dog Wrighty more than his ex.
He said: “She’s got the dog and that is killing me. It is one thing that I massively miss. I don’t really miss Lauren because I am not missing the rows.”
And he said he wasn’t ready to meet a new girl yet – and that it would “kill” him to see Lauren even holding hands with another man.
Meanwhile, Lauren’s new close friend Katie said she would not step away from the limelight and stop promoting herself and her products until people tire of her.
She told Marie Claire: “I’m very ambitious. And success is the best revenge. Everyone who said, ‘You can’t do this, you won’t do this. Ha ha you’ll be finished’.
“It’s not about money at all. I just love it. I’ll carry on until people get bored. It can only end when people don’t want it.”
And she admitted she can’t name all of the books she has released because there are so many of them.
Katie added: “Do you know how many books I’ve got out? I’ve got 40. I’ve got pony stories, I’ve got mermaids. From young ages to, well, women. I can’t sit here and name them all, because I don’t know all their names.”
