Rihanna spent the day at trendy retailer H&M as she launched her Fashion Against AIDS charity line, featuring a collection of T-shirts, hoodies and tanks aimed at young adults fifteen through twenty-four.

The line hopes to raise awareness of the disease among teens with slogans like “Believe” and “Stop and Think.” Prices are expected to range from $12 to $34.

Twenty-five percent of the sales from the collection will go to HIV/AIDS-prevention projects worldwide.

Finnish fashion house Marimekko is the latest designer name to agree to create a collection for H&M.

The fashion house are using some of their extensive back catalogue of patterns from the ’50s, ’60s, and ’70s for their collaboration with H&M and will produce a line of around fifty pieces to be launched in April 2008.

The collection will feature floaty tunics, skirts and dresses and for men there will be shirts and shorts.

“Our design team has long admired Marimekko’s vivid prints and colours. When our designers came up with the idea of creating a collection with Marimekko prints, it felt natural and just the right time,” H&M head of design Margareta Den Bosch

“The summer collection 2008 will be joyfully fresh like a vitamin injection,” she added