Christine Baranski celebrated Mamma Mia!'s grand return to Broadway with great fanfare - and a surprise red carpet date. Earlier this week, Baranski, 73, stepped out at the Winter Garden Theatre in a sequined silver suit with a pair of sunglasses. While walking down the red carpet, Baranski held hands with singer King Princess. King Princess, 26, sported a newspaper-inspired button-down blouse with black trousers, a studded belt and a tangle of silver necklaces. King Princess (born Mikaela Mullaney Straus) later shared moments from the red carpet outing via social media.