The "Rock of Ages" star uploaded an Instagram video of a masked friend lying in a hospital bed and asked her followers to identify the patient.
"Well, this is my night at the emergency room, on a Sunday night with... guess who!" Julianne said, adding the caption: "Who would I be at the Emergency Room with on a Sunday night?! Thank God I went to visit this little sheesh!"
Julianne Hough shared a photo at the Emergency Room.
Many fans guessed correctly, prompting Hough to add: "Ohhhhhhh @nina Momma J's got you... crystals and all."
But Julianne didn't offer up any details about why Nina was in the hospital or whether she was OK.