A demure rat named Lily (above) donned a couture wedding dress, while others wore frilly concoctions tailor-made for their tiny frames.
"The rats look very cute and seem to like wearing them," Nieves told the Daily Mail. "Rats are very popular these days and the owners love to dress them up."
Nieves, who also designs clothing for dogs and cats, even designed a matching tux for a furry little groom. "The smaller the piece, the more tricky it gets," she explained.
We hope she's working on a Duchess Catherine knock-off!
See more animal fashion on PEOPLE Pets:
Fashion Forward! Canine Couture Creations
Cats Do Fashion for Matilda's Famous Birthday