It looks like Ariana Grande and her boyfriend Jai Brooks are still going strong as the 18-year-old comedian took to Twitter to post a special message to his girlfriend on her milestone birthday.

According to Hollywood Life, on June 26th the "Problem" singer turned 21-years-old and her beau shared a romantic birthday message for her that involved calling her the "most beautiful girl in the world." How sweet is that?!

Brooks 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!!"

The cute couple seems to be happier than ever after getting back together in early May. A source revealed, "Ariana and Jai are great," adding, "They spend as much time together as possible and are really happy."

Even though Ariana Grande can legally drink insiders doubt that she will be hitting the club scene hard and throwback shots.

A source revealed, "Ariana doesn't go in public that much. She usually just hangs out at home with friends," adding, "They watch movies, Jai draws and they listen to music. Pretty basic."

This was a sweet gesture from her boyfriend seeing as she has been reportedly feuding with her "Sam and Cat" costar Jennette McCurdy.

The famous blonde recently wrote article on Twitter about a "troubled friend." She explained, "There seem to be a lot of articles floating around the web right now that provide tips for ditching this ambiguous 'trouble friend', so I wanted to provide my take on the matter, with a very personal example."

McCurdy wrote, "As for what happened to our friendship, it faded once through happenstance and it is happening this time through my stance. I'm standing up for myself. I'm not playing your games, letting you manipulate me, and succumbing to your twisted perception of reality.

"Where did I go? As far away from you as I can get. You won't be hearing from me anymore because sweetheart, being a friend to you was doing so much more for you than it was doing for me. You sucked the life right out of me, and I want my life back.

"Did you do something wrong? Yes and no. I'm not sure whether you intentionally did something wrong or not, because I have always been a little unclear on what exactly your intentions are. But you did do something wrong in the way you did not treat me right."

What are your thoughts about Jai Brook's sweet Twitter message to his girlfriend Ariana Grande? Let us know in the comment section below.