She wore her new red locks in a side-parted ponytail ... However, Grande's latest look marks her first major hair transformation since she went blonde a few years. Prior to her Glinda years ...

Maura's latest look comes just a month after she was caught up in a kissing scandal with married McFly frontman Danny Jones.

In the past month, the Stranger Things actress has gone from mousy brown, to bombshell blonde, to bubblegum ... held in place with an oversized red ruffled hair clip.

However, Grande's latest look marks her first major hair transformation ... from a few forays into blonde highlights over the years. The last time Grande went for a red hue was way back in 2012 ...