Is Madonna nostalgic for the past? Singer posts PDA pic with Sean Penn ahead of birthday

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Madonna's birthday is just around the corner, and the pop culture icon is taking a second to reflect on the past.

Before she turns 57 on Sunday, the entertainer posted a throwback photo of Sean Penn -- whose birthday happens to fall one day after Madonna's -- lovingly kissing her cheek.

"Its almost our birthdays!! 2 Leo's ❤️#rebelhearts," the singer captioned the black-and-white pic of the former couple, who married on her 27th birthday in 1985.

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It's a particularly sweet callback to a happier time when the two celebs were together, even though their relationship was rocky at best.

Remember when Madonna dedicated her 1986 album, True Blue, to Penn? In the dedication she wrote, "This is dedicated to my husband, the coolest guy in the universe." The two divorced in 1989.

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Is Madonna nostalgic for the past? Singer posts PDA pic with Sean Penn ahead of birthday
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0243 -- Pictured: Host Jimmy Fallon, Madonna and The Roots during the Music Room segment on April 9, 2015 -- (Photo by: Douglas Gorenstein/NBC)
NEW YORK, NY - MARCH 24: (EXCLUSIVE COVERAGE) Jimmy Fallon and Madonna sign the Facebook wall before their livestream interview at the Facebook offices on March 24, 2012 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
NEW YORK, NY - MARCH 24: (EXCLUSIVE COVERAGE) Madonna signs the Facebook wall before her livestream interview with Jimmy Fallon at the Facebook offices on March 24, 2012 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
X-mas is coming early! Pre order my album and download 6 tracks! Happy Holidays! ❤️#rebelheart
US pop diva Madonna sits among Malawian children during a visit to the Mkoko Primary School, one of the schools Madonna's Raising Malawi organization has built jointly with US organization BuildOn in the Kasungu District, Central Malawi, on November 30, 2014. Madonna met Malawi's new president on November 28 after her VIP status was restored in the country where she adopted two children but then fell foul of the former government. Madonna has adopted two children from the country, which officially has more than a million orphans and vulnerable children. AFP PHOTO/AMOS GUMULIRA (Photo credit should read AMOS GUMULIRA/AFP/Getty Images)
SATURDAY NIGHT LIVE -- Jimmy Fallon/Justin Timberlake Episode 1651 -- Pictured: (l-r) Madonna, Justin Timberlake, Jimmy Fallon, Cecily Strong -- (Photo by: Dana Edelson/NBC/NBCU Photo Bank via Getty Images)
US star Madonna (L) walks out with Dr. Eric Borgstein(R) after visiting the Queen Elizabeth Central Hospital (QECH) on November 27, 2014 where he launched a new project with Ministry of Health to construct a pediatric surgery and intensive care unit at the hospital in Blantyre. AFP PHOTO/STRINGER (Photo credit should read STRINGER/AFP/Getty Images)
NEW YORK, NY - NOVEMBER 05: Editor in Chief WSJ. Magazine Kristina O'Neill, dancer Charles 'Lil Buck' Riley and Madonna attend WSJ. Magazine 2014 Innovator Awards at Museum of Modern Art on November 5, 2014 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - OCTOBER 30: (Exclusive Coverage) Kanye West, Madonna and Riccardo Tisci attend Keep A Child Alive's 11th Annual Black Ball at Hammerstein Ballroom on October 30, 2014 in New York City. (Photo by Kevin Mazur/Child2014/WireImage)
NEW YORK, NY - NOVEMBER 05: Madonna speaks at WSJ. Magazine 2014 Innovator Awards at Museum of Modern Art on November 5, 2014 in New York City. (Photo by Mike Coppola/Getty Images)
NEW YORK, NY - NOVEMBER 05: Madonna attends WSJ. Magazine 2014 Innovator Awards at Museum of Modern Art on November 5, 2014 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - OCTOBER 30: (Exclusive Coverage) Madonna attends Keep A Child Alive's 11th Annual Black Ball at Hammerstein Ballroom on October 30, 2014 in New York City. (Photo by Kevin Mazur/Child2014/WireImage)
LOS ANGELES, CA - JANUARY 26: Singer Madonna arrives at the 56th GRAMMY Awards at Staples Center on January 26, 2014 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - JANUARY 26: Singer Madonna and son David Banda Mwale Ciccone Ritchie arrive at the 56th GRAMMY Awards at Staples Center on January 26, 2014 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - JANUARY 26: Singer Madonna and son David Banda Mwale Ciccone Ritchie arrive at the 56th GRAMMY Awards at Staples Center on January 26, 2014 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - JANUARY 26: (L-R) Rapper Macklemore, singer Mary Lambert and singer Madonna perform onstage during the 56th GRAMMY Awards at Staples Center on January 26, 2014 in Los Angeles, California. (Photo by Kevin Winter/WireImage)
LOS ANGELES, CA - JANUARY 26: Singer Madonna performs onstage during the 56th GRAMMY Awards at Staples Center on January 26, 2014 in Los Angeles, California. (Photo by Kevin Winter/WireImage)
LOS ANGELES, CA - JANUARY 26: Singer Madonna performs onstage during the 56th GRAMMY Awards at Staples Center on January 26, 2014 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
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But there's no bad blood here between Madonna and Penn, who turns 55.

"I'm very friendly with my first ex-wife," Penn said in a January interview with Esquire U.K.

Madonna's teenage son Rocco even channeled Penn's character, Jeff Spicoli, from 1982's The Fast Times at Ridgemont High in 2014 which she proudly showed to the world. "Jeff Spicoli is alive and well in the South of France! #boom #fuzzy," she captioned the candid moment.

As we count down the days to the Material Girl's 57th, here's hoping she makes a splash like she did last year!

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