By JADE WATKINS
She celebrated her 21st birthday over the weekend by enjoying a dinner with her family and then a Hollywood party with her pals.
But Selena Gomez was also keen to share her major milestone with her fans.
The pop star premiered her new video clip, titled 'Birthday', as her big day officially came around on Monday.
Selena is seen enjoying a house party with friends
In the music video, Selena is seen having the mother of all house parties with a large group of friends.
Showing off her toned midriff in a cropped top and shorts, the brunette beauty looks all grown up.
Dancing to the beat of the track, the on and off girlfriend of Justin Bieber has a ball partying with the large group.
And it seems that Selena has been eager to turn 21 for a while, as at the end of the song she is heard saying, 'Finally'.
Selena looks all grown up
Selena debuted the new video on Monday and accompanied the clip with a message for her fans.
'I wanted to celebrate my 21st Birthday with all of you, so we made this video for us all to celebrate to,' she wrote.
'Thank You for all the love and support you have shown and continue to show me. I love you all so much!!'
It was back to work for Selena on Monday, who had celebrated her 21st at Julianne Hough's 25th birthday bash at the Roosevelt hotel with Lily Collins on Saturday night.
Selena shows off her toned figure in a cropped top and tiny shorts