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Miranda Lambert, Anderson East

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Looks like somebody ended their Valentine's Day on the right note!

Fans were well aware that Anderson East was going to be spending part of his holiday performing on the East Coast. What they weren't exactly expecting, however, was a surprise appearance by Miranda Lambert.

E! News can confirm the "Over You" singer spent her Sunday evening at Pearl Street Nightclub in Northampton, Mass. where her boyfriend was performing a few songs with his band. While she stayed in the background for part of the show, she couldn't help but step on stage later in the night for a little V-Day collaboration.

In video posted on YouTube and social media, Miranda is seen belting out to Mariah Carey's "Always Be My Baby" with her man close behind.

As you likely could have guessed, the intimate crowd loved every minute of it as the two enjoyed the impromptu duet.

"'Boy don't you know you can't escape me, ooh darling cause you'll always be my baby' .... I got to spend heart day with great people playing great music," Miranda shared on Instagram after the show. "Thanks @andersoneast and your sweet band for letting me and @gwensebastian sing some Mariah with y'all! #beerandmicrophones #valentines #massachusettsisfreezing #werewiththeband."

Anderson added, "NYC, Boston - y'all were absolutely amazing. Thanks so much for the hospitality! Happy Valentine's Day, love birds."

Earlier this weekend, a source shared with E! News that Miranda is "definitely in love" with Anderson. In fact, the twosome has already opened up about their future together.

"They both have discussed wanting kids one day," our insider shared. "When they are both not on tour, they are with each other. They video chat or text and keep connected every day."

Our insider added, "She is in the best place of her life now and looking forward to the future!"