Jason Derulo and Jordin Sparks performed Baby It's Cold Outside during the Disney Parks Christmas Day Parade, which aired Christmas Day on ABC.

Sparks, who celebrated her 24th birthday on Dec. 22, wore a floor-length purple gown, while her boyfriend sported all black attire.

The love birds also shared a comical moment on stage when Derulo added his own spin to the song.

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After Sparks sang the words, "What's in this drink?," Derulo said, "No cabs to be had out there," along with "apple juice." Sparks laughed at the added last two words.

The pair then slow danced and also flirted onstage.

The couple, who has been dating for over a year now, recently sparked rumors that an engagement is on its way. However, Sparks insisted she's not sure when it will happen.

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"As far as the engagement and stuff? I have no idea. I'm the girl. I'm not supposed to know! When the time is right that'll definitely happen but we're in a really, really, good place," she told Zap2it in December. "He loves me; I love him. We've had conversations about our future and things like that. We're good."

Despite their busy schedules, both singers also make sure that they always have time for each other.

"We have this two-week rule, which is amazing," Derulo said on Access Hollywood Live in July. "We never let two weeks pass by without seeing each other and that really works for us."

Tags: Jason Derulo Jordin Sparks