Star Magazine has a new cover story that Sarah Jessica Parker’s husband of 11 years, Matthew Broderick, 46, had a now-over affair earlier in the year with a 25 year-old “youth counselor” he met in a bar. Star has plenty of details and supposedly has “sources” to support their tale, but they have been busted making up supporting information for completely bogus stories in the past and this isn’t necessarily accurate or even based on any eyewitness accounts. It’s worrying, though, and you wonder if there’s any truth to it:

In the new issue of Star — on newsstands now — we report that while the beloved actress was frantically searching for hubby Matthew Broderick one night earlier this year, he was having sex in the city with a gorgeous redhead half his age, the young woman told a friend.

After meeting in a bar, Matthew began text messaging the 25-year-old youth counselor, says the woman’s pal. Soon after, the insider claims, they began seeing each other and things got passionate quickly when they met at the Manhattan townhouse of a showbiz friend.

Sources say the woman felt conflicted with her relationship with Matthew, whom she nicknamed “Matty Cakes.” She tried to end it, say insiders, but that didn’t happen and over the next month — when Sarah Jessica was filming Sex and the City: The Movie in Los Angeles — multiple eyewitnesses say they saw Matthew make late-night visits to the other woman’s apartment building.

During one tryst, they arrived at her friend’s apartment after a night of heavy drinking, says a source. She dragged Matthew into the friend’s bedroom, then shut the door. “A half hour later, Matthew opened the bedroom door, mumbled ‘Well… ‘bye!’ and walked out. The friend found her passed out on the bed in her panties.”

[From Star Magazine’s website]

There are rumors that Broderick plays for the other team, but those seem to be based on the fact that he does a lot of theater work and has gay friends as a result. Parker and Broderick have been married for over ten years and those rumors have little merit.

Maybe some fan girl made up a story and told Star she has a friend who had a fling with Broderick. Remember that crazy story that a French prostitute told X17 about how she had an affair with Eva Longoria’s husband Tony Parker? That wasn’t true at all and the woman even tricked a “Germany’s Next Top Model” contestant into reading from a script and recording videos claiming she had an affair with Tony.

This is Star, though, so there might not even be a woman who claims to have a friend who had an affair with Broderick, or she might work in their mail office and happened to have agreed to the story after a few cocktails. MSat reminded me today that a photo Star ran on their “ANGIE COLLAPSES!” cover was just Brad helping pregnant Angelina up after she was sitting on the beach.

Matthew Broderick and Sarah Jessica Parker are shown at the Sex and The City premiere on 5/27/08. Credit: Michael Carpenter / WENN