Michelle played Lance Corporal Georgie Lane in the second series of the show and will be reprising her role in the third series.
Sharing a snap of the script on a table, with her name card and highlighters also in the shot.
The excited actress captioned the image: “She’s back!!! Read-through today for the next series of ‘Our Girl’! #georgielane #exciting #letsgo @bbcone.”
In the last series, Georgie was forced to confront her feelings for her ex-boyfriend Elvis (Luke Pasqualino) while her fiance Jamie (Royce Pierreson) waited for her back home.
By the end of the series, the love triangle that had emerged still hadn’t been resolved.
The 29-year-old actress took over from Lacey Turner, who played the lead character in the first series of Our Girl.
Tony Grounds, the show’s creator, has promised that the series will take a turn when it returns to our screen.
Speaking to Radio Times, he revealed that the show will focus on emergency disaster relief as opposed to the brink of war.
He added: “I’m going to be looking where the natural disasters are and where the British Army’s involved.”
It’s also been teased that Lacey Turner could return to the new series, and Tony said that if Lacey wanted to come back “all she had to do was ring him.”