Alicia Keys has opened up about how proud she is of her 11-year-old son, Egypt, and their "Somewhere Over the Rainbow" duet.

In a recent interview with Entertainment Tonight (ET), the 40-year-old singer said: "I couldn't even believe it. I was, like, tearing up and I felt so crazy because he's like, 'Mom, what?' And I'm like [laughs], 'Nothing!' It's just amazing."

The singer even said his son has a "beautiful voice" and she's happy that the boy agreed to record the song with her.

"And you know what... I think sometimes it's hard to even have the courage to try and I wouldn't even blame him if he was like, 'I don't, you know, not right now,'" Keys explained. "But he was open to it. He has a beautiful voice. It's a version of 'Somewhere Over the Rainbow,' which is a song that we've sang since he was a baby. And now we have this song together! It's a sweet lullaby that we did on Apple. And it just dropped. So, I have to say I was, like, super proud mom zones."

The track is part of Keys' "Sweet Dreams" EP, which dropped on Apple Music last month. Described as a "collection of lullabies in Spatial Audio," the EP contains four tracks, such as "Somewhere over the Rainbow," "Best of Me," "Underdog" and "Oh Holy Night." According to the music and video streaming service, it is "perfect for quiet time with the little ones" during the holiday season.

In April, Keys had a proud mama moment on Instagram when she posted a video showcasing her son's musical skills. In the clip, the mom-and-son duo could be seen performing Eurythmics' "Sweet Dreams" Are Made of This" with Egypt on the piano and Keys on the background vocals.

In the caption, Keys wrote, "Egypt On The Keys___. I love being a part of his practice and I love being his background singer! He is making magic __."

The singer also told ET that Egypt is really into music and would usually join her and her husband, music producer Swizz Beatz, at music tours. She also revealed that Egypt is keen on playing the drums or any other musical instrument.

"When I hear him play, I definitely stop in my tracks," she said.

"I'm listening to his chords and I'm listening to his choices. It's not been a surprise because he's always been connected to it. He sings a lot of Bruno Mars, and I think when Bruno and Anderson .Paak go on tour, I'm definitely bringing Egypt because I think it would open his mind to what's possible," Keys added.

Alicia Keys, seen here in a file picture, has urged young people in the Gulf Arab region to "be bold", in an interview with AFP in Dubai
Alicia Keys, seen here in a file picture, has urged young people in the Gulf Arab region to "be bold", in an interview with AFP in Dubai GETTY IMAGES NORTH AMERICA via AFP / Theo Wargo