Behold: Beyonce's bed head!

On Tuesday morning, the Beyonce Knowles -- typically one of the world's most glamorous, decked-out stars -- rolled out of bed in Rio de Janeiro and waved sweetly to fans from her hotel balcony.

Sasha Fierce's a.m. look? A midriff-bearing t-shirt, boxer shorts -- and seemingly no makeup or hair product!

The surprisingly fresh-faced 28 year-old singer was in Brazil to shoot a music video with Alicia Keys; the singers have a duet "Put It in Love Song," on Keys' new album.

Tell Us: what do you think of Beyonce's no-muss no-fuss makeunder?