Doing What She Does Best (We Think)

After her appearance on Showtime’s Weeds, Mary-Kate Olsen is moving to network television.

The pint-size twin is set to be the latest guest star on Samantha Who?, starring Christina Applegate.

Who knew that show was still on?!

ABC has just confirmed that MK is shooting an episode this week where she’ll play a character that Samantha will try to save.

An insider says of MK, “She started today, and she’s terrific.”

According to sources, everyone is very pleased with Olsen’s performance.

Could this mean another appearance for her????

And, with Mary-Kate trying to get back to work, we wonder what Ashley Olsen is up to these days????

Does anyone know????

[Image via WENN.]