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So I guess we're officially back into the on-again swing of Katy Perry and John Mayer's epic, years-long, on-again off-again romance? Because they were the talk of the Met Gala after-party circuit after they were spotted locking lips, holding hands and generally canoodling at a soiree at the Boom Boom Room, according to Us Weekly. (Also, I'm sure it's a fun place and all, but that really just sounds like toddler code for the bathroom.) So if you, like me, have a fancy, two-sided Perry-Mayer sign on your fridge — kind of like a "clean or dirty" sign for the dishwasher — kindly flip it to "on," because they're totally on.

RELATED: Katy Perry and John Mayer, again?

Speaking of on-again, off-again romance, relations between Justin Bieber and ex Selena Gomez appeared to warm, as the two were seen acting civil toward each other at Rihanna's after-party, where they "exchanged some words," according to E! News. And while he even told the paparazzi that "Selena looked gorgeous" on his way out, he was apparently more focused on making an impression on the fashion world. So, you know, be afraid of that. "It meant so much to Justin," a source says of his attending the Gala. "It was definitely his entrance into fashion. He was honored and happy the whole time." Wow, the whole time? Impressive.

Follow Ned Ehrbar on Twitter: @nedrick

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