Singer and Disney Channel darling Selena Gomez turns 20 on Sunday. Gomez, who is best known for her role as Alex Russo on the Disney Channel show Wizards of Waverly Place, has been romantically linked to pop superstar Justin Bieber.

Selena Gomez is set to spend the day with her family. She will then attend the Teen Choice Awards show, where she is nominated for three awards, according to TheCelebrityCafe. Justin Bieber will join her as he has also been nominated. Gomez mentioned that her family is visiting from Texas for her birthday.

The young star has more than 12 million Twitter followers, and she can brag that she was trending on the social network not only on her birthday, but also on the day before it. Our Selena is 20 was popular on the site throughout Saturday, thanks in part to the support of boyfriend Justin Bieber, who tweeted: Our Selena is 20. RT if you'll never stop supporting this girl no matter how old she is.

Happy Birthday Mamacita Gomez was also trending worldwide. The number of tweets picked up steam as Saturday drew closer to Sunday.

Many fans wondered what Bieber would buy Gomez for her birthday. One thing he probably won't arrange is another meeting with fellow former Disney Channel star Shia LeBeouf, who Gomez reportedly has a crush on. (Watch the video of their first meeting below.) Among the speculated gifts was the entire state of California.

The couple was spotted shopping at Target this week without their usual walls of security, although they did wear disguises, according to the Justin Bieber Zone.  

Historically, Gomez has drawn brickbats as well as bouquets on Twitter, mostly because of her similarity to past Disney Channel pop stars such as Hilary Duff and Miley Cyrus. Whenever Gomez draws negative attention, however, her normally restrained, teenybopper fans tweet venomous comments aimed at her critics.