Ricky Gervais (in-universe)

Ricky Gervais was a human celebrity. In 2004, he attended the opening of the Tomorrow Windows at Tate Modern. (PROSE: The Tomorrow Windows)

Behind the scenes
He also wrote, directed and was the executive producer for Extras: The Special with Stephen Merchant. The special featured Gervais' character Andy Millman, star as Shlong who faced the Tenth Doctor and an unnamed companion.