Not all celebrity couples make like Kim Kardashian and Kanye West. In other words, some got married very much on the Down Low.
So low down, in fact, that we didn't even know they were planning on getting hitched until the big day had already come and gone!
Some of these surprise celebrity marriages may even last, too, although in some cases, more forethought may have been prudent ...
JENNIFER ANISTON AND JUSTIN THEROUX
Jennifer Aniston and Justin Theroux told guests in August 2015 that they were attending a birthday party at their home. But then they went ahead and got hitched!
IAN SOMERHALDER AND NIKKI REED
Four months after announcing their engagement, Ian Somerhalder and Nikki Reed quietly exchanged vows in Santa Monica ... without anyone outside their inner circle knowing about it until it had already gone down!
KRISTEN BELL AND DAX SHEPARD
Kristen Bell and Dax Shephard got married on the spot in 2013 after a court employee offered up an immediate ceremony. The entire thing cost $142.
KELLY CLARKSON AND BRANDON BLACKSTOCK
Kelly Clarkson and Brandom Blackstock engaged vows in an intimate ceremony in Tennesse. The singer simply told fans about it the next day via social media.
KERRY WASHINGTON AND NNAMI ASOMUGHA
Kerry Washington and Nnami Asomugha got married in Idaho... and that's still all we know. Few stars are as guarded with their personal information as the Scandal beauty.
ANNE HATHAWAY AND ADAM SHULMAN
Anna Hathaway used the same wedding planner who helped keep Natalie Portman’s nuptials quiet when she tied the knot with Shulman in 2012.
BLAKE LIVELY AND RYAN REYNOLDS
Many didn't even know Blake Lively and Ryan Reynolds were engaged when they tied the knot in South Carolina in late 2012.
RACHEL WEISZ AND DANIEL CRAIG
Four total guests were included at the New York City-based marriage of Rachel Weisz and Daniel Craig in June of 2011.
MIRANDA KERR AND ORLANDO BLOOM
In July 2010, Kerr and Bloom for married just one month after getting engaged. A month later, they announced they were expecting a child. Hmmm....
CALISTA FLOCKHART AND HARRISON FORD
Calisa Flockhart and Harrison Ford dated for eight years. They were then quietly married by then-Governor Bill Richardson in New Mexico.
PENELOPE CRUZ AND JAVIER BARDEM
Cruz and Bardem only told close friends and family members about their intimate 2010 ceremony, which was officiated by a friend.
ISLA FISHER AND SACHA BARON COHEN
Fisher and Cohen had been engaged for years and were about to welcome a baby when they tied the knot. But the actual ceremony only took place in front of six guests, with no advanced public hype.
MANDY MOORE AND RYAN ADAMS
Moore and Adams were only engaged for a month before getting married in Savannah. They kept out of the spotlight, but lasted for nearly five years.
RENEE ZELLWEGER AND KENNY CHESNEY
Renee Zellwegger and Kenny Chesney actually eloped in St. John. Alas, the union was not very long-lived.
BRITNEY SPEARS AND JASON ALEXANDER
Britney and Jason Alexander got married in Las Vegas in 2004. They then got the union annulled 55 hours later.
ANGELINA JOLIE AND BILLY BOB THORNTON
How shocking was this marriage? Thornton was engaged at the time to Laura Dern!
KELLY RIPA AND MARK CONSUELOS
Kelly and Mark dated secretly for a year and then eloped in Las Vegas in 1996.
MILA KUNIS AND ASHTON KUTCHER
Rumors abounded for months, but Mila Kunis and Ashton Kutcher finally said "I Do" over July Fourth weekend. They didn't say a word about the ceremony leading up to it.
ALEXIS RODERICK AND BILLY JOEL
How secret was Billy Joel's fourth marriage? The guests themselves had no idea they had been invited to a wedding until it was happening!
USHER AND GRACE MIGUEL
Usher and Grace Miguel are married! See the singer's gold wedding band? This Instagram photo was shared after the two eloped in September of 2015.
They have two kids together, so it makes sense they'd be married. But the stars VERY quietly tied the knot, way under the gossip radar, in 2016.
Robbie is married! How did the ceremony go down? Click on the above headline to find out!
AMY SCHUMER AND CHRIS FISCHER
Yes, this is a photo of Amy Schumer and her HUSBAND, a chef named Chris Fischer. They shocked the world when they got hitched in February of 2018.
SOPHIE TURNER AND JOE JONAS
Joe performed on stage with his siblings at the Billboard Music Awards -- and then he and the actress got married in Vegas! This shocker went down in May of 2019.