Originally published on ProWrestlingSheet.

'90s icon Macaulay Culkin was in attendance at Barclays Center on Sunday to watch SummerSlam ... and he was rocking a pair of blue bunny ears the whole time.

Culkin -- who's known to be a bit eccentric these days -- was spotted ringside with Brenda Song wearing interesting headgear, as well as backstage while taking pictures with WWE Superstars.

Mac snapped photos with Becky Lynch, Natalya and James Ellsworth.

Another celebrity in attendance was Lin-Manuel Miranda and apparently he's a big wrestling fan, which he spoke to Mike Rome about during a backstage interview.

Watch the video and check out the pics of Macaulay below.