Katy Perry and Miranda Kerr talk about their close relationship - CNN

Kerr and Bloom share 10-year-old son Flynn together.

"In our modern family, she's probably the most health-conscious of everyone," Perry said of Kerr, who was promoting her KORA Organics skincare line's new turmeric moisturizer.

Perry said she often gets the opportunity to try out Kerr's products, which she sends over with Flynn.

"One of the great things about being close to Miranda is I get to try out all her products, especially when her son [Flynn] comes home with them in his backpack," Perry said.

"Flynn will always bring this amazing nugget of knowledge on either skincare or food."

The two also discussed motherhood and babies.