Undercover Beauty

Twins named Ma'liyah and Aaliyah are known as nerds at school. They have three good friends that they always talk to and their never scared to stand up for themselves. Their personality changes outside of school, yet only their friends know about it. They are in seventh grade and are all thirteen but act way more mature than all the kids at school. Then they all meet this girl and her brother and they are twins, but the girl's brother likes one of the five girls. Who is it tho?
You have to read to find out.