Rihanna 'very tired' at album release party

Rihanna was "very tired" at her album release party on Tuesday.

The 'Diamonds' hitmaker had been due to celebrate her latest album 'Unapologetic' at New York nightspot 40/40 following her show in the city - the final date of her '777' tour - but her hectic schedule from playing seven gigs in seven countries in seven days left her in a low-key mood.