Meghan Trainor couldn't stop crying tears of joy after her brother surprised her with a Christmas gift.

The 21-year-old "All About That Bass" singer was overjoyed after her brother Ryan revealed he had covered her home with a bunch of twinkling Christmas lights and other festive decorations, according to Billboard.

After Meghan Trainor saw the display, which included an illuminated "Joy" sign and a colorful cross, she burst into uncontrollable happy tears.

Trainor posted a video to Instagram of her reaction, paired with caption, "I have the best big brother in the world. @ryan.trainor surprised me with crazy Christmas decorations because he knows I'm obsessed with Christmas and lights."

On "Jimmy Kimmel Live!" Trainor revealed she lives with her two cats and two brothers. She even hired one of her brothers to videotape her life while she's on tour.

While Trainor is close with her brothers, she also has a strong bond with her father, who was the one that told her men like curves on women and inspired her hit song "All About That Bass."

"My mom told me to always not worry about your size and be very confident," Trainor said to Entertainment Tonight. "But I think that [my dad] was the one who really said, 'Don't worry, baby -- boys like booty to hold at night.' My mom's too sweet, she's too innocent."

Trainor is nominated for Best New Artist for the upcoming Grammy Awards. She will be competing to win the title against Courtney Barnett, James Bay, Sam Hunt and Tori Kelly.

Trainor released her debut album, "Title," on Jan. 9, 2015. The album, which topped the Billboard 200 chart and U.K. Albums chart, has produced the singles "All About That Bass," "Lips Are Movin," "Dear Future Husband" and "Like I'm Gonna Lose You" featuring John Legend.