Louis Walsh impressed his fellow judges on US X Factor.
The UK show's panellist stepped in as a last minute replacement for auditions in Kansas after Simon Cowell was taken ill with bronchitis and the veteran judge was a hit with his fellow professionals.
Britney Spears said: "I love Louis, he's really fun and I think he's absolutely adorable. I do miss Simon a little bit though."
Demi Lovato added: "There is only one Simon...but Louis killed it on Friday (08.06.12)."
Meanwhile L.A. Reid, who butted heads with Louis over one contestant, held no grudges, saying: "I absolutely love working with Louis.I find him fascinatingly quick, thorough, and remarkably entertaining."
Louis was equally impressed with the US judges and said: "I'm loving everyone on the panel and nobody seems to be missing Simon."
After he was taken ill Simon convinced bosses at the Fox network that Louis was the best person for the job due to his vast experience on the British show and immediately arranged a £160,000 round-trip by private jet to cover for him at auditions and Saturday (09.06.12) in Kansas City.
Simon, who is recovering at his multi-million-dollar home, hopes to have recovered in time for the next auditions in San Francisco on June 16.