Meryl Streep has joined the presenting line-up at this weekend's Oscars.

The star - who is favourite to land the best actress Academy Award for her role as former PM Margaret Thatcher - joins previously announced presenters such as Halle Berry, Tom Cruise, Cameron Diaz, Michael Douglas, Penelope Cruz, Will Ferrell, Tom Hanks and Angelina Jolie.

Meryl, who won rave reviews for her performance in The Iron Lady, has been Oscar nominated a record 17 times and already won two statuettes.

Her stage role at Sunday's ceremony in Hollywood - the 84th Academy Awards - was announced by telecast producers Brian Grazer and Don Mischer.

Other presenters at the event, hosted by Billy Crystal, include Rose Byrne, Bradley Cooper, Will Ferrell, Tina Fey, Zach Galifianakis, Milla Jovovich, Jennifer Lopez, and the cast of the comedy Bridesmaids.