click to enlarge Image via SLMPD

Nicholas Keeton was charged with impersonating a police officer.

Congrats to 2nd District Officers of the year Police Officers Gregory Bushart & Andrei Nikolov. #ThisIsABigDeal pic.twitter.com/QBr4ujn4kv — Chief Sam Dotson (@ChiefSLMPD) March 10, 2015

A fake cop slipped up when he pulled over a real St. Louis police officer, authorities say.Nicholas Keeton, 20, hit the lights and sirens on his Impala about 12:30 a.m. on Thursday and pulled alongside Andrei Nikolov's car a couple of blocks west of Sublette Park in the Southwest Garden neighborhood, according to court documents. The only problem? Nikolov, while off-duty at the time, is a St. Louis police officer.Keeton, an imposing figure at 6'5" and 260 pounds, claimed he was an officer in the department's First District, authorities say. But Nikolov, who was the 2014 Officer of the Year in the neighboring Second District, wasn't fooled and reported the alleged pretender.More real cops arrived and arrested Keeton, who lives in 6400 block of Wanda Avenue in the Boulevard Heights neighborhood, on suspicion of impersonating a law enforcement officer, a misdemeanor.