The former TOWIE star joined with S Club 7 singer Rachel Stevens to host the annual Caudwell Children Butterfly Ball on Thursday, 25 June.
Mark and Rachel – who became friends on the Strictly Come Dancing live tour – looked uber glamorous as they posed for the cameras on the purple carpet at Grosnevor House Hotel.
It was Rachel who asked Mark to join her in co-hosting the glamorous event, with Mark saying: "Rachel told me all about the Butterfly Ball and asked whether I would like to get involved. It sounds like an unbelievable event and I'm just pleased that I can help such a worthy cause."
The Butterfly Ball is the flagship fundraising event for Caudwell Children, a charity which supports disabled children and their families. Several celebrities are patrons including Peter Andre, Liz Hurley and Robbie Williams.
This year's event attracted a slew of celebrity guests including Sir Bruce Forsyth, Aston Merrygold, The Saturdays' Vanessa White and Rod Stewart.
Lionel Richie performed.
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