Beautiful: The Carole King Musical celebrated its Broadway opening exactly four years ago today, officially bringing the music of Carole King into the musical theater lexicon. And yet, it took almost another four months for the show's namesake to come see the musical about her legendary life and career.

On April 3, 2014, Carole King reneged on her vow to abstain from seeing the show, and took a trip to the Stephen Sondheim Theatre to surprise the Broadway cast — particularly Jessie Mueller, who ended up winning a Tony Award for her portrayal of the singer-songwriter. King joined Mueller and the rest of the original cast in a rendition of "You've Got a Friend," while also raising $30,000 for Broadway Cares/Equity Fights AIDS. It remains one of the most Beautiful days in the show's Broadway history, so we're flashing back to this emotional surprise to celebrate the production's impressive four-year milestone.

For tickets and more information about Beautiful, click here.