Sporting black-rimmed glasses and appearing topless, Katie was all smiles in the close-up snap shared via Instagram.
She simply captioned the photo: "Night #kpnation."
Mum-of-five Katie had spent the weekend at her ex-husband Peter Andre's concert.
Proving that they are well and truly back on friendly terms, Katie told fans that it was a "great concert", adding that 'Insania' - the song Peter penned in the jungle on I'm A Celebrity...Get Me Out Of Here! - "brings back memories".
Her weekend picked up despite falling ill on Friday ahead of her regular guest appearance on Loose Women.
Katie had arrived at the ITV studios for a planning meeting beforehand, but was unable to go through with the show following a bout of food poisoning.
Loose Women panellist Andrea McLean said Katie was having a "medical emergency" and that nurses were tending to her.
Katie even filmed a segment for the show, wrapped up in a duvet on the sofa where she said: "I haven't been sick for about an hour now but I still feel sick, from both ends. Don't miss my banter too much!"
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