She's SUCH a people person. In fact, the only other celebrity we reckon would be sound (with just the right level of self-involvement) enough to do this is Bill Murray... He's quite the keen runner. 

Schumer was reportedly enjoying a jog in Central Park, and just lobbed the head in while Joseph Turnage and Brandon Moore were engaging themselves in a proposal photoshoot, which is extremely organised and not-at-all impromptu of them. 

According to Us Weekly, Schumer asked all involved, including the photographer Alisa Siegel, if she could join them for their special moment and they were only too happy - if a little bemused looking. 

Posting the below to Instagram, the comedienne said: "Beautiful engagement photo ruined by yours truly."
  


Recalling the scenario, photographer Siegel (who is presumably available for all your 'engagement photoshoot' needs) said:

"We were taking engagement photos and ending the day in Central Park near the reservoir on 86th street on the East Side. As we are snapping photos, someone running by [all of a] sudden screams, 'Oh my God, are you guys taking engagement photos? Lemme get in one!' I thought it was a little weird but I said yes anyways... She took off her sunglasses, we snapped a quick pic, and right after she says, 'You guys know I'm like reeeal famous.' I take another look it hit me that it was Amy Schumer! We all cracked up, and then she continued on her afternoon jog in Central Park."