In the last year, for one reason or another, Kate Upton, Kylie Minogue and Nick Cave have all paid unannounced visits to the Slovenian capital. Today (once again) British pop star Robbie Williams is in Ljubljana.

The 41-year-old Williams is reportedly shooting a new commercial (we haven't managed to find out for which brand, all we know is that it is for a foreign company) in the Viba film studio. Security around the studios in Stegne, Ljubljana, has been stepped up with two security teams. No one is allowed to enter the premises. Everyone involved has also signed a non-disclosure agreement.

The official response, passed out to the media, is that only Williams’ double is in Ljubljana. Unofficially we did find out that in truth it is the "original" Williams that is in the capital; however, no one can get close to him.

This is not the first time for the singer to stop by in Ljubljana unnoticed. At the end of September he was in Ljubljana for two days, but was unable to shoot the commercial in question due to bad health.

He reportedly flew to Slovenia both of those times with a private jet. According to well-informed sources Robbie Williams stayed at the presidential apartment at the Grand Hotel Union in September. The last time he was there he stayed in bed for two days treating serious back problems.