Girlsactress Allison Williams and pop star Katy Perry haven’t always been BFFs.

The duo first met throughWilliams' ex-husbandand co-founder of College Humor,Ricky Van Veen.

She’s the coolest" (viaDaily Mail).

Katy Perry and Allison Williams Red Carpet

However, Perry wasn’t the only one in the friendship to be burned by heartbreak.

We are grateful for the friendship we have and will continue to have."

Williams also showed her support for Perry when she went as her date to the 2013 Grammy Awards.

Katy Perry and Allison Williams Laughing

Perry asked Williams to attend the award show with her in lieu of then-boyfriend John Mayer.

OnAnderson Live, Williams said of Perry, “She’s the hottest date.

She’s a friend of mine and she’s nominated, as she should be.

Katy Perry and Allison Williams Hugging

I can’t wait to go.

Obviously she’s awesome.

She’s the best” (viaE!).

Katy Perry and Allison Williams Blonde

In an interview withRefinery29, she explained just how random the occurrence really was.

“We just couldn’t believe it.

We weirdly ended up going blonde on the same day.

And she was like, ‘Me too!’

It was hilarious.”

As any true friend knows, hyping up one another’s even most questionable beauty choices is non-negotiable.

Williams proved her loyalty to Perry by stating, “I’m obsessed with it.

It’s really cool.

She’s so beautiful so she can pull it off.”