The college prep expert who masterminded a nationwide admissions scandal that was publicly revealed Tuesday helped parents set up bogus pictures of their kids playing sports — and even Photoshopped teens’ faces onto stock photos of athletes to help them fraudulently get recruiting slots on teams at elite schools, prosecutors allege.

One of William “Rick” Singer’s preferred scams to get the kids of his bribe-paying clients into the schools of their choice was to funnel a cut to college coaches, who would fast-track the students for admisssion using their designated recruiting slots, officials said.

And they didn’t let the fact that some of the teens had never even played competitive sports get in their way, allegedly staging — or outright creating — bogus photos of them in action to make their applications seem legitimate to any skeptical eyes, prosecutors said.

“In many instances, Singer helped parents take staged photographs of their children engaged in particular sports,” Massachusetts US Attorney Andrew Lelling said in a Tuesday press conference. “Other times, he used stock photos, sometimes Photoshopping the face of the child on the athlete, and submitting it.”

To help the son of one co-defendant, California equity firm executive William McGlashan Jr., get into the University of Southern California, Singer said they would create a bogus athletic profile for the teen, according to court filings.

“I’ll pick a sport and we’ll do a picture of him, or … we’ll put his face on a picture, whatever,” Singer allegedly told the McGlashan. “I’ve already done that a million times.”

When McGlashan volunteered photos of his son playing lacrosse, Singer shot it down, because USC doesn’t field a lacrosse team.

Singer later left a voicemail message for McGlashan, intercepted by a federal wiretap, in which he laid out his plan to pass McGlashan’s son off to the USC football team as a special-teams whiz — even though his high school didn’t even have a football squad.

“I’m gonna make him a kicker/punter and they’re gonna walk him through with football,” Singer told McGlashan. “I’ll get a picture and figure out how to Photoshop and stuff … so we’ll put a bunch of stuff about that on his profile, and we should be in pretty good shape to get that done.”

When McGlashan called back moments later, Singer said that they would explain away the son’s purported kicking prowess by saying he attended a kicking camp outside of school.

“He does have really strong legs,” McGlashan responded with a laugh, according to court filings.

“So what I’ll probably need, if you guys have any pictures of him playing multiple sports, or something where you can kind of see his face a little bit in the action?” said Singer. “It would be helpful because I will Photoshop him onto a kicker.”

McGlashan again laughed at the idea, saying, “Pretty funny. The way the world works these days is unbelievable.”

Singer then regaled McGlashan with a tale of helping another parent present their son as a water polo player.

“When the dad sent me the picture, he was way too high out of the water,” said Singer. “That nobody would believe that anybody could get that high.”

“So I told that dad, I said, ‘What happened?’” Singer recalled. “He said he was standing on the bottom [of the pool]!”

In addition to Singer and TV actresses Felicity Huffman and Lori Loughlin, the 50 people facing federal charges in Operation Varsity Blues include a number of prominent college coaches and athletic directors.

Among the schools represented on the dubious list are the University of Southern California, Yale, Stanford, Georgetown, Wake Forest and the University of Texas.