Every marriage has its up and downs -- even when you're Super Bowl champion Tom Brady and supermodel Gisele Bundchen.

The picture-perfect couple has been the focus of multiple divorce rumors in the past month, but a source close to the 35-year-old Brazilian bombshell tells ET that "they are doing better than ever and are very much in love."

Although, that's not to say everything is 100 percent rosy. According to another source close to the couple, the two go through "a rocky point every fall" due to Gisele's "perfectionist" ways and the 38-year-old quarterback's intense focus on football. "When football season starts, he only thinks about football and the family takes a backseat," the source says. "Gisele likes everything to be done her way, and on her timeline."

WATCH: Tom Brady and Gisele Keep Quiet Amid Split Rumors

Still, the two have a new project to work on together -- building a massive home in Boston. Gisele in particular "has picked out every door knob and wall color that is going in there," the source says about the legendary model's involvement in the decorating and designing of the house. "That has been her number one focus right now."

The couple was spotted in New York City on Monday, looking very much together while getting into the back of a truck.

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In May, the couple also enjoyed their vacation to Costa Rica and the Bahamas, where they were seen swimming and playing with their kids and sharing lunch together in Baker's Bay. "There was visible closeness there," an eyewitness says. "Gisele and Tom had lunch together and she playfully grabbed a bite from his pizza."

Tom and Gisele have been married since February 2009, and have two children together -- 5-year-old Benjamin and 2-year-old Vivian. Tom also has a son from his previous relationship with actress Bridget Moynahan, 8-year-old John.

The genetically-blessed pair certainly looked more in love than ever celebrating the New England Patriots' big Super Bowl win in February, but their storybook relationship has come under intense scrutiny recently, due to both Tom's Deflategate drama, and also his surprising involvement in Ben Affleck's highly publicized nanny drama.

Last month, ET obtained a picture that Christine Ouzounian -- the 28-year-old former nanny of 43-year-old Ben and 43-year-old Jennifer Garner who reportedly had an affair with the Oscar-winning actor -- previously sent to several of her friends, showing her wearing Brady's four Super Bowl rings on her right hand. Ouzounian was on the private jet with Ben and Tom, as the group headed to Las Vegas for a charity poker tournament in late June.

Ben's rep has strongly denied the affair allegations, calling the original report "complete garbage" and "full of lies" in July.

ET has reached out to Tom and Gisele, but they have yet to comment on the divorce rumors. However, Gisele did wish her husband a happy birthday on Aug. 3, by sharing a pic of the two kissing on Instagram. "Happy birthday my love!" she wrote. "We're so blessed to have you in our lives. Thank you for always giving us so much love. We love you! #love #family ❤️❤️❤️"