Three of John Mellencamp’s grandkids helped him onstage Wednesday night as he sang his hit song “Jack & Diane” in Los Angeles.

“Which of these 4 rockstars attended the @johnmellencamp concert and today needs a Pedialyte and 4 naps?” John’s daughter, Teddi Mellencamp, captioned a group photo of herself with the three youngsters.

The “Real Housewives of Beverly Hills” alum, 41, stunned in a black leather jumpsuit from Alice + Olivia, which she paired with black boots and a slicked-back ponytail.

Her kids — Slate, 9, Cruz, 6, and Dove, 2, whom she shares with husband Edwin Arroyave — dressed the part in their grandfather’s merch.

“I have a surprise, I have grandchildren who are dying to help me sing this song,” John, 71, told the audience during the LA stop of his John Mellencamp: Live and In Person Tour, per People.

The “Two T’s in a Pod” host previously revealed her father — who was once known as Johnny Cougar — has a great sense of humor, and surprised her kids with parakeets for Easter.

“So when we were kids we had parakeets and one day the Cougs got annoyed at the parakeets and let them go,” the proud mom said on her podcast last year.

“He said he’s been feeling guilty about it all these years. So that’s why he decided to surprise us with them on Easter,” she added, joking that it was a gift she “never wanted or asked for.”

Teddi has also been in the headlines after claiming that Lisa Vanderpump “paid” “Vanderpump Rules” star Raquel Leviss to have an affair with her co-star Tom Sandoval.

The SUR restaurant owner swiftly shut down her former co-star’s allegations.

“No I didn’t pay cast members to sleep together for ratings,” she tweeted earlier this month, noting that they “do that on their own.”

She went on to call Teddi’s theory — which she peddled on an episode of Melissa Gorga’s “On Display” podcast — “fake news.”

Sandoval’s longtime girlfriend Ariana Madix broke up with him on March 1 after stumbling upon a sexually explicit video of Leviss on his phone.

The clip led to the discovery that the pair had been having an affair for months.