Olivia Rodrigo is thrilling fans with her latest musical era, but her fashion choices may be striking a sour note.

The Grammy-winning singer, who's gearing up for the release of her third album "You Seem Pretty Sad for a Girl So in Love," made waves online after her performance at Spotify's Billions Club show in Barcelona, Spain, over the weekend. The "Billions Club" series recognizes artists whose songs have accumulated more than 1 billion streams on the streaming platform.

During her May 8 performance, the 23-year-old pop star wore a white babydoll dress. The short-sleeved frock featured a floral pattern and a skirt that hit above Rodrigo's thighs, and she paired the look with knee-high black leather Dr. Martens boots.

The retro-inspired dress echoed the outfit Rodrigo donned for her "Drop Dead" music video.

The outfit's dainty look sparked backlash on social media, with some comparing Rodrigo's dress to children's clothing.