Beyoncé Knowles shed a tear when 'Dreamgirls' co-star Jennifer Hudson won the Best Supporting Actress Oscar on Sunday night (25.02.07).

The singer-and-actress - wearing a revealing white Armani gown - was overcome by emotion as the 'American Idol' contestant tearfully accepted her Oscar.

A source said: "Beyoncé wiped away tears as she watched Jennifer get up on stage to accept her award."

Later on, the two girls performed a medley of songs from 'Dreamgirls'.

Beyoncé's track 'Listen' was nominated for Best Song, along with 'Love You I Do' and 'Patience' - both of which are also from the film.

Beyoncé - who wasn't nominated at this year's Academy Awards - has previously admitted it is her dream to one day win an Oscar.

The Oscar for Best Song eventually went to 'I Need to Wake Up' from the global warming documentary 'An Inconvenient Truth', which was made and stars Al Gore

Beyoncé and Jennifer were rumoured to have an ongoing rivalry on the set of 'Dreamgirls', but both have denied the claims.