The guest list for season 4 of 'Girls' just keeps getting longer and more and more exciting. Maude Apatow, charming daughter of writer/director Judd Apatow and co-star of several of her father's films, has just been added to the 'Girls' season 4 roster as a guest star, reuniting with her 'This Is 40' co-star Lena Dunham.

Entertainment Weekly reports that Maude Apatow, the eldest of Judd Apatow and Leslie Mann's two daughters (the other being the adorable Iris), will guest-star on season 4 of 'Girls' in an as-yet-unspecified role. Apatow has previously played what are basically fictional versions of herself in her father's films, including 'Funny People' and more recently, 'This Is 40' -- in which 'Girls' creator and star Lena Dunham also appeared. Her father also produces the hit HBO series.

The 15 year-old star is also pretty popular on Twitter, where she's amassed a huge following. Although she hasn't yet acted in any projects outside of Judd Apatow's films, Maude has already defined herself as a promising young talent, and we can't wait to see what she'll do on the fourth season of 'Girls.'

'Girls' season 4 has also cast 'Orange Is the New Black' star Natasha Lyonne, Zachary Quinto, 'Parenthood' star Jason Ritter, and 'Community' actress Gillian Jacobs, making our wait until the 2015 premiere all the more agonizing.