Glee: Get a First Look at Katey Sagal's "Sweet" Debut as Artie's Mom

Cameras rolled Wednesday on Katey Sagal's first day on Glee and it didn't take long for the Sons of Anarchy star to get close with her new TV son.

"Gleefully being Artie's mom!! Sooo sweet!! Hangin with beautiful Becca and Awesome Kevin," Sagal tweeted, along with a photo of her next to Kevin McHale and Becca Tobin. "Lovin it."

Photos: TV's worst-dressed characters

Ryan Murphy announced last week that the Golden Globe winner would be appearing in an episode this season as Artie's mom. Sagal tweeted about her new gig on Friday, saying that she would be "singin' a tune or two," and that, unlike her Sons character, "Artie's mom [is] not packin.'" Spoiler alert!

The casting was especially a dream come true for McHale, who had been pitching Sagal to play his TV mama since the beginning of Season 4. "Too anxious to sleep," he wrote late Tuesday.

Sagal joins an impressive slate of returning Glee guest stars, such as Idina Menzel, Kate Hudson and Sarah Jessica Parker, who will all make appearances before the end of the season.

Glee returns with new episodes on Thursday at 9/8c on Fox. Are you excited to meet Artie's mom?