Squoval Nails

Katy Perry at the 51st Annual GRAMMY Awards at Staples Center in Los Angeles, CA on February 8, 2009.

Katy Perry at the 2010 American Music Awards at the Nokia Theatre L.A. Live in downtown Los Angeles, CA on November 21, 2010.

Katy Perry at the 2012 MTV Video Music Awards Arrivals at Staples Center in Los Angeles, CA on September 6, 2012.

Selena Gomez at the world premiere of “The Thing” at Universal Studios Hollywood on October 10, 2011 in Los Angeles, CA

Selena Gomez at the 2010 Teen Choice Awards at the Gibson Amphitheatre, Universal Studios, Hollywood on August 8, 2010 in Los Angeles, CA

Jesy Nelson’s colorful french manicure — orange with hot pink tips

Kreayshawn’s mismatched nails in metallic green, gold and blue and zebra stripes with pink tips.

Ke$ha’s silver nails at US Weekly’s Hot Hollywood Event at Colony in Hollywood, CA on November 18, 2010.

Lexus Amanda’s black nail polish

Demi Lovato’s nails at the 2011 NCLR ALMA Awards held at Santa Monica Civic Auditorium on September 10, 2011 in Santa Monica, CA.