May 16, 2015 was a big day for college sweethearts Alexa Agourides and Jonathon Feinstein. Not only did the pair graduate from Westminster Choir College in Princeton, New Jersey on that day, but they also got engaged.

After the commencement ceremony, Jonathon and his brothers from the Phi Mu Alpha music fraternity gathered around Alexa and serenaded her with a romantic song aptly titled "A Serenade to a Girl." The lyrics of the song are about Phi Mu Alpha's "sweetheart" and are sung to honor a special woman -- in this case, Alexa.

"I knew I wanted to propose somewhere meaningful for the both of us," Jonathon told The Huffington Post. "With such a small school community, we were lucky to be close with almost everyone that we attended school with. Proposing after our graduation seemed like the perfect idea."

After the serenade, Jonathon got down on one knee to pop the question. And although you can't really hear it in the video, we can confirm that she did, indeed, say "Yes!"

"It was honestly kind of a blur," he told HuffPost. "I prepared something to say but ended up speaking off the cuff. I remember saying that Alexa was the woman I had been waiting for my whole life, and that she encourages me to be the best version of myself. Then, I asked her to marry me."

"I thought she would be crying, but she didn't stop smiling the whole time!" Jonathon said. "I think she was overjoyed at seeing the faces of myself and so many friends singing to her."