In another Instagram post, Messing and McCormack hug tightly.
“You smell the same! @EricMccormack,” the actress wrote.
Although they reunited for Mullally and Offerman's comedy show, it seems as though the cast have got back together for something more.
Mullally, who played Karen Walker on the hit series shared a photo of herself on what looks like a film set whilst tweeting, "I remember this place."
Messing also excited fans by sharing a photo of herself with the caption, "I feel like something BIG is going to happen tomorrow."
"I used to be able to do this without glasses...", McCormack tweeted along with a photo where he is reading a script-like book.
Finally, Hayes also tweeted, "Beverly Leslie comes up to here on me," referring one of the show's other characters.
If Debra Messing's message is anything to go by, fans will have to wait till tomorrow to see if their hopes for a reunion are confirmed!
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