Just last month, the trio looked oh-so-adorable and happy while running errands around Los Angeles. So it came as a shock when the pair issued a joint statement today announcing their split after nearly three years of marriage: "After careful consideration, we have made the difficult decision to file for divorce. We remain friends and deeply committed and loving parents to our son Bronx, whose happiness and well-being remains our number one priority."
In December, the threesome were the picture of a happy family at an Old Navy holiday event in Los Angeles.
Ashlee and Pete were both thrilled when big sis Jess announced her engagement to beau Eric Johnson. Pete dished, "Eric's a really great guy and I think the greatest aspect of Eric is that he makes Jessica genuinely happy," while Ash added that her future brother-in-law was "amazing."
The concerned parents rushed to the scene in May 2010, when 1½-year-old Bronx and his nanny, who was behind the wheel, were involved in a minor accident in L.A.'s Coldwater Canyon area. Fortunately, no one was injured.
Did Fall Out Boy really break up? Nope. Pete explained back in February 2010 that the band was just on a break: "I think that after having Bronx, and with my wife having this much of a workload right now, it has been such a good thing for me. There's nothing I wanna be better at in the world than being a dad."
No, it wasn't Halloween. The playful couple just decided to have some fun in New York City back in January 2010.
After a brief stint on Melrose Place, Ashlee made her Broadway debut as Roxie Hart in Chicago in December 2009—with her rocker hubby by her side, natch. Asked about her post-stage plans, Ash said, "I'm gonna have some mommy time and take a little break."
The family was flying high in October '09, when the 'rents took young Bronx on his first trip to Disneyland.
Pete and Jessica were on hand to help Ashlee celebrate her 25th B-day in Las Vegas back in October '09.
In June 2009, the mister and missus took part in NOH8—a campaign supporting efforts to overturn Proposition 8, which banned gay marraige in California.
The Fall Out Boy rocker was touring—and partying—with his band just months after the birth of their son. "Bx and I miss you so much," his new wife tweeted in April '09. "We are only the 2 amigo's without you. Last night I wanted a snuggle fest with you. Miss you mucho."
Bronx Mowgli Wentz came into the world at L.A.'s Cedars-Sinai Medical Center in November '08—and then came all the questions about his, er, unusual name.
Just over a month after becoming engaged, Ash, 23, and Pete, 28, married in an Alice in Wonderland-themed wedding in the backyard of her parent's Encino, Calif., home. Papa Joe performed the nondenominational service, followed by a party that went till about 1 a.m.
Eleven days after their wedding, the couple announced that—surprise!—they were expecting their first child together.
Ashlee's father, Joe, came along for the bash as Pete kissed his bachelor life goodbye. The crew of 10-plus guys dined at Mr. Chow and then partied at the Roosevelt Hotel in Hollywood.
The happy couple announced their betrothal news via FriendsorEnemies.com in April 2008: "We know there has been a lot of speculation recently about Pete and I and we wanted our fans to be the first to know, because you guys are the best. Yes, we are thrilled to share that we are happily engaged," Ash wrote. Pete asked dad Joe Simpson for permission before he popped the question—awww.
Well, not exactly. Pete and Ashlee began dating in late 2006, but they broke up—and made up—a number of times before officially becoming a couple in spring 2007.
MORE PHOTOS: Big Celebrity Splits