"It's actually about being an actor in L.A. It's basically kind of a roast of myself, the whole thing," McHugh said jokingly. "[John] directed it, I'm in it, we wrote it together and we had a lot of fun doing it. Josh Peck helped us out with it too and Brittany Furlan... she's in it too."
Clearly, blurring personal and professional lines was a positive experience for McHugh. "They say if you can do a film together, you can do anything together," she explained. "I'm very happy to say we survived the filming process and we're in editing now. We're both still alive so it's great!"
The ridiculously good-looking duo has been dating for nearly a year, but have kept private about their relationship.
John Stamos out and about
John Stamos out and about
HOLLYWOOD, CA - FEBRUARY 22: John Stamos arrives at the 87th Annual Academy Awards at Hollywood & Highland Center on February 22, 2015 in Hollywood, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - NOVEMBER 22: Actor John Stamos poses in the press room at the 2005 American Music Awards held at the Shrine Auditorium on November 22, 2005 in Los Angeles, California. (Photo by Vince Bucci/Getty Images)
UNIVERSAL CITY, CA - JANUARY 23: Actor John Stamos of the television show 'Jake in Progress' listens to a question during the ABC 2005 Television Critics Winter Press Tour at the Hilton Universal Hotel on January 23, 2005 in Universal City, California. (Photo by Frederick M. Brown/Getty Images)
BEVERLY HILLS, CA - MARCH 31: Actor John Stamos, arrives at 'A Stellar Night' Gala Honoring actress Dakota Fanning by the Starlight Starbright Children's Foundation held at the Beverly Hilton Hotel, on March 31, 2006 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
NEW YORK - APRIL 18: Actor John Stamos arrives at the A&E Network's 'Up-Fronts' event to unvail its Fall 2006 season line-up at the Time Warner Center's Fredrick P.Rose Hall April 18, 2006 in New York City. (Photo by Clarence Elie-Rivera/Getty Images)
BEVERLY HILLS, CA - JANUARY 15: Actor John Stamos arrives at the NBC/Universal Golden Globe After Party held at the Beverly Hilton on January 15, 2007 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
NEW YORK - FEBRUARY 13: (EXCLUSIVE ACCESS) Actor John Stamos meets with television personality Rachael Ray on the 'Rachael Ray' show on February 13, 2007 in New York City. (Photo by Bryan Bedder/Getty Images)
BURBANK, CA - AUGUST 03: Actor John Stamos arrives to 'Comedy Central Roast Of Bob Saget' at the Warners Brothers Studio Lot on August 3, 2008 in Burbank, California. (Photo by Alberto E. Rodriguez/Getty Images for Comedy Central)
404347 27: Actor John Stamos arrives at the Roundabout Theater Company's 2002 Spring Gala April 22, 2002 in New York City. Plummer received the inaugural Jason Robards Award for contributions to the theater. (Photo by Lawrence Lucier/Getty Images)
NEW YORK - OCTOBER 7: Actor John Stamos joins the cast of 'Nine' with Eartha Kitt at the Eugene O'Neill Theatre October 7, 2003 in New York City. (Photo by Scott Gries/Getty Images)
UNIVERSAL CITY, CA - JANUARY 23: Actor John Stamos arrives at the ABC's Winter Press Tour Party on Wisteria Lane on January 23, 2004 in Universal City, California. (Photo by Vince Bucci/Getty Images)
CULVER CITY, CA - OCTOBER 27: ActorJohn Stamos front row at the Shakti Spring 2005 show at the Mercedes-Benz Fashion Week at Smashbox Studios October 27, 2004 Culver City, California. (Photo by Carlo Allegri/Getty Images)
377853 18: Actress Rebecca Romijn-Stamos kisses her husband John Stamos as they arrive at the 2000 Emmy Awards September 10, 2000 in Los Angeles, CA. (Photo by David McNew/Newsmakers)
HOLLYWOOD, CA - OCTOBER 11: Actor John Stamos attends the Los Angeles Premiere of 'Team America: World Police' at the Grauman's Chinese Theater October 11, 2004 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
FULL HOUSE - Cast Gallery - July 1, 1987. (Photo by ABC Photo Archives/ABC via Getty Images)JODIE SWEETIN;BOB SAGET;JOHN STAMOS;DAVE COULIER;CANDACE CAMERON
File Photo of actor John Stamos taken in Los Angeles, Calif. on 7/27/84. (Photo by Bob Riha Jr/WireImage)
FULL HOUSE - Cast Gallery - June 26, 1987. (Photo by ABC Photo Archives/ABC via Getty Images)JOHN STAMOS
FULL HOUSE - 'Knock Yourself Out' - Airdate: October 30, 1987. (Photo by ABC Photo Archives/ABC via Getty Images)JOHN STAMOS
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"I'm very happy, he's super supportive, and I really couldn't ask for anything better," the brunette beauty said. "We like to keep our lives private because we've seen what relationships in the public eye can be like and we just like our privacy."
McHugh recently celebrated a major milestone -- her first starring role in the crime-thriller, 48 Hours to Live, alongside James Maslowe.
"James was wonderful," McHugh said. "Actually, our steamiest scene was our very first day of working together... [The film crew] threw us right in! They're like, 'Hi, get naked, have fun!'"
Looking to the future, McHugh, who's also a martial artist, hopes to add "bada** superhero or villain" to her acting resume.
"I would love [to work for] Marvel," she said. "Star Wars, if we're talking dreams. [And be able to play] a strong woman who's not on the sidelines trying to get saved, kicking-ass and taking numbers!"
48 Hours to Live is available On Demand.
RELATED: John Stamos was one of the celebs who stripped down in 2016:
Celebrity nude shots in 2016
Celebrity nude shots in 2016
There's just too much hotness to handle in this photo ... "Fuller House" star John Stamos flashed his chiseled abs but chose to keep it PG by covering his you know what ...
Goodness gracious! Gigi Hadid stripped down to nothing as the sexy covergirl of Vogue Paris.
Kylie Jenner wished her beau Tyga a happy birthday with one of the most NSFW couples photo we've ever seen.
And Kylie Jenner's racy snap continues with this one ... in which she's covered entirely in blue body paint.
Heidi Klum stripped down to nothing but her bikini bottoms while taking a casual dip in the pool.
Alicia Silverstone got naked for a good cause for a PETA ad. The former "Clueless" star's hot body was on full display on a New York City billboard.
It's wasn't a complete week in 2016 without a racy snap from Emily Ratajkowski! The "Blurred Lines" video vixen stripped down to nothing in this jaw-dropping photo ... but there's definitely more where that came from.
This Kim Kardashian nude photo is pretty self-explanatory ... she captioned this one "#liberated."
One of the most controversial naked pics of 2016 came from Miss Kardashian herself. "When you're like I have nothing to wear LOL," she captioned the snap.
Sharon Osbourne was "inspired" by Kim Kardashian to take a racy selfie of her own!
Sexy lady! Bella Hadid freed the nipple for her French Vogue cover.
💥💥Sorry mama 😇 Secret project with my dream team @nomadrj and @elizabethsulcer 😻😻😈😇😇 #BTS
Candice Swanepoel dared to bare her baby bump. Pregnant or not, the Victoria's Secret model always looks incredible!
Of course hot photos while taking a bubble bath is a must for Mariah Carey.
Chrissy Teigen gave the ultimate birthday present to one of her best pals -- a naked pic.
Khloe Kardashian has been flaunting her revenge bod on Instagram all year long -- and we're not complaining!
Halle Berry made her Instagram debut in jaw-dropping fashion -- with a classy naked photo, of course!
"Modern Family" star Ariel Winter made headlines throughout 2016 over her racy outfits ... but this photo takes the cake.
Only Chelsea Handler would be ballsy enough to wish Reese Witherspoon a happy birthday with a naked selfie!
Comedian Amy Schumer raised awareness for gun safety with a head-turning snap that she took in a perfect angle as to not reveal too much.
Just a man with his coffee! Josh Brolin enjoyed his morning beverage sans clothes ... and we don't see a problem with that.
Singer Jake Shears kicked off 2016 with a bang ... and a naked booty shot! Who knows what 2017 will bring ...
Former "Dancing With the Stars" contestant Mischa Barton oozed sex appeal in her shirtless snap during her trip to Greece.