Jeanette Miller is the second oldest of the Chipettes and the female counterpart of Simon Seville. She is also the most intelligent one.
She is voiced by Anna Faris and her singing voice is Janice Karman.
In the CGI films, Jeanette has violet eyes and purple glasses. She also has brown hair in a loose bun. In Alvin and the Chipmunks: The Squeakquel, she wears a blue denim jacket with a light purple shirt, a blue/purple skirt, and a silver sparkle dress. In Alvin and the Chipmunks: Chipwrecked, she wears a purple and white striped shirt with a blue white-starred skirt held by a purple belt, a purple-sparkle dress, and purple-flowered garments. In Alvin and the Chipmunks: The Road Chip, she wears a purple and white striped shirt and a skirt with white, pink, and purple rectangles between blue vertical and horizontal stripes topped with a black belt.
She has an insecure personality, regularly saying "i'm not that great at things like this". However she eventually learned to be brave and take more risks, though still being cautious.
Alvin and the Chipmunks: The Squeakquel 
Brittany and her sisters met Ian Hawke and was hoping that she and her sisters would meet the Chipmunks but Ian told them that they already left him. He also told them that they made him very upset because Alvin literally spat on him and he didn't want to mention the other two making the Chipettes believe that the Chipmunks are mean just to take revenge against the Chipmunks and became very excited to use the Chipettes as his minions. When she and her sisters meet the Chipmunks at school she tells her sisters that Ian said they can't trust them. Later she and her sisters sing a song on stage to help Ian convince Dr Reuben to let both the Chipmunks and Chipettes sing at the school concert, but she initially refuses but she finally agrees.
After she and her sisters sing at the school concert. When she and her sisters are approached by Ian to inform them about the over singing concert at the Staples Center, she and her sisters are initially excited but they realize that this means they'll missed the school contest and when Ian tells them that will be singing however he wants them to which means mainly having Brittany so they refuse unless they all sing together. Then Ian threatens them by grabbing their tales and holding them upside down and hurting them making Brittany realize that Alvin was right about Ian. She gives Alvin a phone call to let him know that Ian locked her and her sisters up in a cage and Alvin goes to save them. After Alvin saves the Chipettes from Ian they go to the school concert to perform and they all became friends and are now under the care of Dave Seville.
Alvin and the Chipmunks: Chipwrecked 
Jeanette and her sisters and the Chipmunks go on for a cruise to the International Music Awards to perform, but when they borrow a kite they accidentally got shipwrecked and go to an island. At the island they meet a strange woman named Zoe who takes them under her wing.
Alvin and the Chipmunks: The Road Chip 
It's Dave's birthday and the Chipmunks and Chipettes throw a giant house party for him and they all start dancing around and having fun but when Dave arrives he becomes really disappointed so the Chipettes head out to the judge american idols. When the Chipmunks accidentally provoke Dave for stealing the engagement ring from Barry, Alvin decides to make Dave happy by singing a song and goes to the Chipettes for help. At the concert the Chipmunks and Chipettes perform for Dave making him very proud of them all. After Alvin thanks the Chipettes for helping them perform for Dave then they head back to the judge "American Idol" for auditions.
- Though her version retains many of the traits she had in the 80s, there are some notable differences.