Olsen twin Mary-Kate is set to make an appearance on the upcoming season of ABC’s hit series, Samantha Who?

An insider from the set tells E!, “She started today, and she’s terrific.”

The 22-year-old twin will play a character that Samantha, aka Christina Applegate, tries to “save.”

If MK fans remember correctly, it was just last year that the tiny twin made an appearance on Showtime’s Weeds, as Tara Lindman (the Christian goody-good)…Seems like sister Ashley’s acting isn’t quite up to par with Mary-Kate’s.

Stay tuned, as the cameo is expected to air this fall!

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