Blake Lively had a hilarious explanation for a social media user about her personal trainer's role in her life.

Blake Lively, who shares four kids with husband Ryan Reynold

After Blake Lively shared a sizzling bikini photo to Instagram July 27, the Gossip Girl alum 

who is mom to kids James, 8, Inez, 6, Betty, 3, and recently welcomed a fourth baby with husband Ryan Reynolds 

After one person wrote, "How do you have 4 kids?" Blake simply tagged her trainer, Don Saladino

Ryan Reynolds is not the father. He's just the one who helps me fit into my clothes again after.

He's an even better person and friend than trainer. And that's saying a lot."

This isn't the first time that the Green Lantern star has given a cheeky shoutout to Don.

In fact, when the actress was expecting her fourth child, she shared a side-by-side photo with him to Instagram taken months apart