PopWatch HeadScratcher No. 29

[This PopWatch HeadScratcher is now CLOSED. See your clever responses here.]

Another PopWatch HeadScratcher to get you through the weekend:

What do these five Oscar-nominated actresses have in common?

Julie Christie
Sally Kellerman
Helen Mirren
Maggie Smith
Lily Tomlin

Send your best guess to popwatch@ew.com. Be sure to include your first and last names. I’ll post the most interesting responses Monday afternoon.