The radio host, 29, wrote: Starting my footballing legends tattoo collection with @ronaldo! while sharing the inking of the Brazilian footballer on his leg.
Appearing on the live show on Friday morning, Capital radio host Roman, 29, was promoting new show Get Britain Singing, set to air on Christmas Eve, which he is hosting.
Stars including Love Island s Tasha Ghouri and beau Andrew Le Page will complete alongside Loose Women s Denise Welch in a bid to impress the studio audience.