(written from a Production point of view)
Katja Rieckermann (born 24 February 1966; age 51) is a professional saxophone player who appeared as a wedding band member in Star Trek Nemesis. She received no on-screen credit for her appearance and was identified by the name tag of her costume which was sold off on the It's A Wrap! sale and auction on eBay, where she was misspelled as "Katja Rieckereon". 
Rieckermann was born in Lübeck, Schleswig-Holstein, in Germany. In her early years she felt in love with jazz music and saw her brother Ralph Rieckermann, guitarist for the German group "The Scorpions", playing the guitar at home. At the age of sixteen she saw saxophonist David Sanborn on a concert and knew the saxophone was her instrument. Rieckermann studied a year in France, alto saxophone at the Yamaha Music School in Hamburg, and at the Berkelee College of Music in Germany before she moved to Los Angeles and expanded her experiences.
After appearances with "The Scorpions" in 1997 and with the Canadian band "Saga", she also performed with Branscombe Richmond and his Renegade Posse on his tour in 2000/2001 and occasionally with actors Jeff Goldblum and Peter Weller since 1999. After a recurring appearance as a musician in several episodes of David E. Kelley's television series Ally McBeal (2000-2001), she met Carmine Rojas, the musical director for Rod Stewart and got the part as saxophonist for Stewart. Since 2001 she has been the saxophonist for Rod Stewart on his concerts, tours, world tours, and television appearances such as on the talk show The Tonight Show with Jay Leno. She has also shown her skills on several DVDs and music albums and has released her first solo album in 2007, titled "Katja Rieckermann". In late 2007 she finished another tour through Europe with Rod Stewart.