The Barbados-born star has just scooped MTV awards for best video and single of the year for Umbrella, which was the UK's summer song - at number one in the charts for 10 weeks - and now just eclipsed by Shut Up And Drive, both from the album Good Girl Gone Bad.
She will swap grey skies for snowclouds to perform in Ischgl village centre at dusk on Saturday 1 December - the first weekend of the new five month long ski season (lifts open on Friday 30 November and close on Sunday 4 May 08). Entry to the concert is free.
Said Tourist Director Andreas Steibl: "We are excited to announce Rihanna as our opening concert star. Her concert will launch the new season in the traditional Ischgl style and set the scene for a great season of skiing and partying.
"Ischgl skiers expect to see the best stars and experience the best skiing and that's what we give them, with superstars such as Elton John, Lionel Richie, Tina Turner and Pink performing in our concerts and a fantastic 235km of pisted runs up on the mountain enjoyed by skiers and boarders."
Ischgl hosts three big name concerts in its Top Of The Mountain series every winter - last season featured The Pussycat Dolls, Scissor Sisters and Melanie C.
New on the mountain this winter is the £13.5m replacement Fimbabahn gondola lift, with heated seats, that will transport 2,800 skiers and boarders an hour from the village up to the main skiing area of Idalp.