J.Lo's despair over: JEN'S ACTION COMEBACK!

LOOK OUT – THERE’S A NEW BUFF JENNY ON THE BLOCK

Jennifer Garner is making an electrifying return to her superhero queen roots in Deadpool 3 – but the news has been a tough pill for her one-time love rival, Jennifer Lopez, to swallow.

“J.Lo is having to muster all her acting skills to make out she’s excited for Jen, but behind closed doors she’s worried,” dishes our exclusive insider. “She’s been hearing all about Jen’s ‘Elektra’ martial arts workout and is bracing for the inevitable comparisons.”

Jen first played the role of Elektra 20 years ago in 2003’s Daredevil opposite Ben Affleck, and then again in the 2005 spin-off Elektra.

Ben, 50, later confessed that he and Jen “fell” for each other as they made the first film in early 2002.

“That’s where I found my wife,” he said in a 2013 interview. “We met on Pearl Harbour, which people hate, but we fell in love on Daredevil.”