The 44-year-old actor who plays Vanessa Woodfield in the ITV soap opera went to Twitter to share the good news.
Michelle shared a photo of herself, Kate and their dog on social media while she was rocking her bump.
The couple looked ecstatic as they smiled and posed for the photo.
She wrote, “Fred’s big brother’s homework starts in October #BabyBrooks. “
Fans flocked to Twitter to congratulate the pair, with Michelle’s ex-co-star Gaynor Faye gushing: “Congratulations OMG – how wonderful! You must be on the moon Revolving heartsSparklesxxx. “
Actress Michelle married producer Emmerdale Kate last year in Memphis in a beautiful Elvis-inspired ceremony.
Posing a photo of herself and Kate on the steps of Elvis’ house, Michelle wrote, “In over 100 degrees of heat, on Tuesday September 10, I became Mrs. Brooks. #Graceland #chapelinthewoods #memphis #nextstopnashville. “
The couple confirmed their romance for the first time on National Cinema Day last year after sharing a photo with rainbow emojis.
Michelle captioned the photo: “It will all work out. “
The soap star was previously married to music teacher Rosie Nicholl, from whom she separated in February 2017.