You can’t tell by looking at her, but singer/songwriter Keri Hilson is as ghetto as they come. The gorgeous “Pretty Girl” singer may look demure and timid on the outside, but get her mad and she will snatch a wig back quick!

According to the NY Post’s Page Six gossip column, Keri, who’s on tour with Lil Wayne, learned the hard way that good help is hard to find.

The 28-year-old beauty wasn’t having it when a hapless assistant forgot to remove a department store tag from her black harem pants before her performance at Haze inside the Aria Resort and Casino in Vegas on Saturday.

A source tells Page Six that the “Knock You Down” singer came charging off the stage and made a beeline for the unlucky assistant. “Hilson lost it,” the source said. “She was screaming at her assistant for ‘not being able to do anything right.’ [She] railed that the assistant also forgot to ‘pack her eye drops and throat spray.’ ”

The unidentified assistant must have known that that was her last day on the tour because she started windmilling at Hilson like they were both in the projects, saying, “Oh, hell no, heiffer!”.

Hilson’s burly security and her manager stepped between the two scrapping women to separate them before wigs got thrown. At some point, Hilson, who got the best of the exchange, stormed off cursing.

Hilson’s rep told Page Six, “Keri did ask her assistant to bring her eyedrops/throat spray as she was feeling under the weather, but there was no altercation. Keri has had the same road staff, from assistant to security, for a few years now.”