Busy Philipps is grateful for her 25-year friendship with Michelle Williams.

“We just know each other and get each other in such a deep, fundamental way at this point,” the “Girls5eva” star tells Page Six exclusively in a new interview.

Philipps notes that the pair have grown up together and “been there through so many different moments in each other’s lives,” from the “really wonderful ones” to those they thought they “might never, ever recover from.”

She adds, “When you have a friend like that, you’re blessed. That’s all you can really ever hope for in this life.”

Philipps, 45, and Williams, 44, met as co-stars on the sudsy ’90s and ’00s teen drama “Dawson’s Creek” and have been BFFs ever since.

In fact, the “Cougar Town” star is often the Oscar nominee’s plus-one at industry events.

“It makes it fun,” Williams told us at the 2022 Gotham Awards.

“These things can be a little … I don’t know if you ever really get used to being on a red carpet. It’s a little overwhelming, but then all of a sudden, I look over and see this gal, and I know whatever happens, we’re going to have a great time and laugh.”

Long before the duo were regular fixtures at Hollywood events, though, Philipps worked as a hostess at California Pizza Kitchen from the age of 15 until she landed her starring role in “Freaks and Geeks.”

The former “Busy Tonight” host swears she never grew tired of scarfing down the chain’s food — not even while flying to the “Dawson’s Creek” set in North Carolina.

“There was a CPK in the airport in Charlotte, and I would get my BBQ chicken pizza and eat it there on my layover,” she tells Page Six. “And then I would get two of the Thai crunch salads and take them to Wilmington, and me and Michelle would eat it for lunch the next day.”

And so, Philipps freaked out when she got a call about teaming up with CPK again in honor of its 40th anniversary this year.

“The ad agency couldn’t believe that I knew the names of the CPK founders off the top of my head,” she shares with a laugh. “I was like, ‘Guys, I worked here for years!’”