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Bart & Stewie team up

How could this not have happened sooner?

The creators of “The Simpsons” and “Family Guy” finally came to their senses and are making a crossover episode between the two animated shows about insane suburban families.

In the show — which will air in 2014 — pea-brained patriarch Peter Griffin brings his family to the Simpsons’ home turf of Springfield, Fox announced yesterday.

Griffin’s maniacal baby son, Stewie, develops an unhealthy affinity for Bart during the episode, while the two dads argue over whose hometown has the better beer (Springfield’s Duff or Quahog’s Pawtucket Patriot Ale).

“The Simpsons” are in their 24th season on Fox, while “Family Guy” is heading into its 11th.

This will be the first time the network has brought the two worlds together, though “Family Guy” creator Seth MacFarlane this season voiced a Simpsons character named Ben — whom Marge Simpson meets on a swingers hook-up site during the season finale that aired May 19.

The meeting of the two hit shows will rank alongside the all-time TV mash-ups — including the 1987 meeting of the Flintstones and the Jetsons in a feature-length episode.