Amber Tamblyn and Blake Lively go back: WAY back. Back to 2005, when the two first filmed the now-beloved classic The Sisterhood of the Traveling Pants. And while their lives have changed plenty over the years, with husbands and babies now in the mix, they remain as close today as they ever were. Close enough for Tamblyn to… drink Blake Lively’s breast milk?

Blake Lively and Amber Tamblyn

Appearing on Andy Cohen’s Watch What Happens Live last night, first-time-mom Tamblyn admitted the dirt to the host after giving him a taste of her own breastmilk, which she just so happened to have on hand. “I pumped when I got here earlier,” she quipped while whipping out a bottle. Cohen opted to take a sip, concluding, “It’s very sweet. It’s sweet. And it’s good with a tequila chaser! Wow. Can I have more? That’s the closest to a breast I’ve ever been.”

Blake Lively and Amber Tamblyn

That’s when the actress thrilled him further by revealing, “I’ve drank Blake Lively’s breast milk. So if that went through me, you’ve technically had Blake’s and my breast milk together.”

Looks like these two are willing to share more than just a pair of traveling pants!

Have you ever tried your own or someone else’s breast milk? Let us know @BritandCo!

(h/t Self; photos via Mark Davis + Scott Gries/Getty)