Rizzoli & Isles star Harmon and former American footballer Sehorn announced their separation after 13 years of marriage late on Sunday (02Nov14), but Robinson Peete only heard the news as a guest on Access Hollywood.
As hosts Billy Bush and Kit Hoover discussed the break-up, the 21 Jump Street actress could be heard gasping in the background.
Explaining her reaction, she said, "It's not cool to find out that your friends are splitting up on live Tv, I'm just saying... (I had) no clue..."
Robinson Peete continues, "(We've been friends) for years... They had the most amazing proposal on the Jay Leno show, and (husband) Rodney and Jason played in the Nfl (National Football League) together... I'm very sad right now."
However, the actress can understand how their busy schedules could have driven them apart as Harmon shoots her Tv crime drama Rizzoli & Isles in Los Angeles, while former New York Giants cornerback Sehorn is rooted in the family's home base of Charlotte, North Carolina on the other side of the U.S.
Robinson Peete adds, "They're bi-coastal; there's a lot going on."
Sehorn famously popped the question to Harmon as she sat down for an interview on America's The Tonight Show with Jay Leno back in 2000, and they wed a year later (01). They have three children together.