Catherine Zeta-Jones had a NSFW birthday shout-out for Michael Douglas.

In honor of her Oscar-winning husband turning 80 on  Sept. 25, the Chicago actress, who turned 55 that same day, went all out posting a throwback photo of herself posing nude in a bathroom while gazing at a mirror.

“In my birthday suit,” Catherine captioned the post. “After over 25 years of sharing my birthday day with my husband, I am running out of gift ideas! This is gift option two, golf balls being option one… of course.”

The social media birthday celebrations didn’t stop with Catherine. The pair’s daughter Carys, 21, dedicated a joint birthday tribute to her parents on her Instagram Story.

“Happy birthday to my incredible parents,” she wrote. “No words can describe my love for you.”

Carys’ message came over a sweet throwback picture of curled up in her father’s arms while he plants a kiss on her forehead, while Catherine sits beside them and her brother, Dylan, 23, stands behind them and grins.

Michael’s major birthday milestone comes just ahead of their 24^th wedding anniversary in November. And as the duo, who wed in 2000, are set to celebrate their 25^th wedding anniversary next year. The romance is still very much alive between him and his longtime love, and they show it off on the golf course.

Following their 22 wedding anniversary in 2022, Catherine spoke about the beauty of waking up next to the same person for over two decades. 

"I've been waking up to Mike for nearly 25 years," the Catherine told The Telegraph. "I love being married but it's a crazy thing when you really think about it. 'Will you marry me?' 'Sure!' But then you think about the Chanel purse you spent a fortune on, and actually I don't really like it any more—I'll put it up for resale."

In July Michael, who also the father of Cameron, 45, shared the NSFW thing Catherine makes him do when he loses while they’re out on the course.

"Whip it out," Michael told the shocked hosts of The View July 10. "She says, 'You've gotta whip it out.'"

However, Michael said that form of celebration would stop when he turns 80.

"I'm going to be 80 in September," he continued, "so now I play off of ladies tees, too, so I don't have to do that anymore."

Keep reading for more on Catherine and Michael’s lasting love…

The couple were glowing with anticipation for their wedding rehearsal dinner at NYC's Russian Tea Room in November 2000.

They cut quite a figure at the L.A. premiere of Chicago in 2002.

Catherine was famously pregnant with Carys throughout the 2003 awards season. She didn't win a Golden Globe on this night, but her name was called at the Oscars a month later.

Catherine channels Audrey Hepburn at the 2003 Nobel Peace Prize Awards Gala.

A couple of fresh fall looks in October 2006.

We're loving CZJ's wavy lob in April 2008.

After bounding back from tongue cancer, Michael looks pretty happy to be alive at the NYC premiere of Wall Street: Money Never Sleeps in November 2010.

They attend the Icon Award Presentation during the 22nd Annual Palm Springs International Film Festival in January 2011.

"Oh, no big deal, just standing next to a goddess here..." in 2011.

The longtime couple sport similar looks during New York Fashion Week in February 2011.

The chic duo step out in New York for the Children of Chernobyl Hosts Children At Heart Gala Dinner in November 2011.

They attend a 2012 Tribeca Film Festival event in April hand in hand.

"Personally, I think they're a little sweet." (Overheard at the 2012 Monte Cristo Awards, which of course doesn't actually honor the sandwich.)

Douglas puts the moves on his wife in 2013 during the annual Vanity Fair Oscar Party.

The couple look happy and healthy at Grey Goose's cocktail reception for The Film Society of Lincoln Center's 40th Chaplin Award Gala in April 2013, a few months before announcing what would turn out to be a temporary separation.

They hit the red carpet at the 2014 AFI Life Achievement Award Gala in Hollywood that June.

The fam shares a holiday vacation pic in December 2014.

The philanthropic pair attend the Phoenix House Public Service Award Dinner in January 2015.

Another glam night out, here at the Saturday Night Live 40th Anniversary Celebration in February 2015.

The patrons of the arts attend the opening night celebration for The Library at The Public Theater in April 2015.

The whole family is there to watch Michael Douglas be honored in Jerusalem with the Genesis Prize, presented by Israeli Prime Minister Benjamin Netanyahu, in June 2015.

Doing a Marvel movie makes premieres a family affair, here at the London premiere of Ant-Man in July 2015 with son Dylan and daughter Carys.

The longtime tennis fans enjoy a day date at the 2015 U.S. Open in September.

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Catherine uploaded this adorable family photo to Instagram in order to express her thanks for her husband and children. 

The lovely couple bundled up to attend Super Bowl 50 at Levis Stadium. 

In the most adorable Instagram post ever, Catherine reminds everyone where Michael proposed to her 16 years prior.

The lovebirds took to Instagram once more to show off their happy faces during a trip to St. Tropez. 

The Oscar winners enjoy some time with Douglas' firstborn Cameron at the Los Angeles Mission Legacy of Vision Gala in November 2017.

The pair dazzle at the screening of Cocaine Godmother in November 2017.

The husband and wife duo attend The Robin Hood Foundation's 2018 benefit in May 2018 in New York.