12 of the Most Notorious On-Again/Off-Again Celebrity Couples

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Tumblr (gifsforgomez)

Despite their seemingly-tenuous relationship, it appears that Katy Perry and John Mayer are really giving it their all — this time around, anyway. On Good Morning America, the on-again/off-again couple debuted the romantic music video for “Who You Love,” the third single off of John’s Paradise Valley album. A sign of true commitment, right? Well, we’ll see…

As cute as Katy & John are together now, we’ve seen how rocky their relationship can get. But they’re in good company on the on-again/off-again front. Here are 12 celebrity couples who are pretty much known for it: