Ariana Grande, Jai Brooks Romantic Birthday Tweets, 'Big Brother' Contestant's Sibling Gets Mushy Message: 'I Really Love You'

Singer Ariana Grande celebrated her 21^st birthday with a romantic tweet from her boyfriend, Jai Brooks.

Jai tweeted, "Happy birthdays to the most beautiful girl in the world, you are 21!!! you're my world I really love you. here's to so many more memories!!"

According to Hollywoodlife, sources says "The Way" singer is complete head over heels Jai, "Ariana and Jai are great," the source added, "They spend as much time together as possible and are really happy."

The couple have a relaxed relationship and have a very private love life, "Ariana doesn't go in public that much. She usually just hangs out at home with friends," the source said. "They watch movies, Jai draws and they listen to music. Pretty basic."

In other -not so mushy- news, it was revealed that the Disney star's brother, Frankie Grande, 28, has been casted for the 16^th season of "Big Brother." The Broadway producer calls himself the "Queen of YouTube" banking in 1.2 million followers on his page.  

What a week for the Grande family!