Michelle Williams Says Person Sitting Next to Her on Plane Took Shoes Off, Shares Pic

Michelle Williams ain't going to "Cater 2 U" if you're taking your shoes off on an airplane ...

taking to social media to call out her seatmate who went barefoot on a flight. The singer-songwriter hopped on Instagram to express her displeasure with the person sitting next to her ..



. sharing a snap of their toes -- totally uncovered and poking out from behind the seat barrier. Michelle wrote, "I PROMISE YOU BETTA GETCHO FOOT FROM ME!!!! 🚨 Y’all this is happening neowwwwwwww on my flight and I am crying real tears!!" MW jokes she accidentally elbowed the foot -- so, she's gotta take her jacket to the cleaners .

.. before lamenting how people in first class feel they can just do whatever they want on planes.

Williams has been busy on Broadway recently ...

starring in "Death Becomes Her" -- the musical based on the 1992 film starring Meryl Streep and Goldie Hawn . She starred in the original cast in Chicago last year ..

. playing Viola Van Horn -- an original character name based on Lisle von Rhuman, who is played by Isabella Rossellini in the OG flick. Unclear where Michelle's flying to here .

.. but, it looks like the next passenger who touches the "Death Becomes Her" star with their feet might end up dead themselves!.