The Geordie Shore star was pictured with the TOWIE hunk in the back of a cab as they headed to London steakhouse STK.
In the sepia snap, which Mario shared with his Twitter followers, they are both pulling crazy faces. Mario is sticking his tongue out while Charlotte looks overly excited about their lunch date.
Alongside it, Mario commented: "Off to @STKLondon with @CharlotteGShore... Starving!"
Charlotte walked away the winner of this summer's CBB on Friday night (13 September), with Mario coming in fifth place. 5ive's Abz Love was runner-up, Lauren Harries finished 3rd, Carol McGiffin 4th and Vicky Entwistle 6th.
Earlier today, we revealed how Carol has vowed to leave the UK.