Actor Meryl Streep joined her 'Mamma Mia!' co-star Christine Baranski for a special performance to honour composer and lyricist Stephen Sondheim, on his 90th birthday concert which aired online on Sunday.

'Mamma Mia!' stars Meryl Streep and Christine Baranski reunite for Sondheim birthday concert

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'Mamma Mia!' stars Meryl Streep and Christine Baranski reunite for Sondheim birthday concert