A creep snapped cellphone photos up a 13-year-old girl’s skirt inside a Long Island Target — but got busted after the kid’s dad caught him in the act, cops said Wednesday.

Aqeel Ahmad, 53, of Selden, allegedly bent down and secretly snapped the sick photos as she browsed greeting cards inside the store last Sunday at around 2 p.m., according to Suffolk County police.

Her father, who police did not name, immediately confronted him — but Ahmad allegedly bolted from the store, leaving customers stunned and the teen terrified, according to investigators.

Suffolk detectives tracked down Ahmad and arrested him inside his car at an intersection in Selden just after 6:30 p.m. on Tuesday, police said.

Ahmad is charged with unlawful surveillance and endangering the welfare of a child, and was

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