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Nicole Richie and Joel Madden can’t stop gushing about their one-month-old daughter, Harlow, and Tom Cruise and Kate Holmes say that two-year-old Suri is “growing so quickly!”

When asked about Harlow at the Eli Broad Contemporary Art Museum in L.A. last night, a glowing Richie said, “She’s doing great!

“Really great, thank you!” added the 26-year-old, who looked slim and rested in a pale-colored dress.

Madden — who donned sneakers with his tux at the black tie event, and stayed arm-in-arm with Richie — chimed in: “Yeah, she’s good!”

Cruise and Holmes say that Suri is, “doing great!

“Yeah, that one I can keep going on about!” Cruise said.

And he’s not the only chatty one. “She’s talking a lot!” Cruise added.

“Every day she does something new,” Holmes, in sky-high gold heels and a strapless Lanvin dress, said. “She’s growing so quickly!”

Cruise said they see a lot of each other in Suri “24/7.”

So how are they spending Valentine’s Day?

“It will” be romantic, Cruise said, but remained mum when asked about the details: “I’m going to keep that to myself, but it’s going to be fun though!”

Also at the star-studded event: Christina Aguilera, in a bright blue curve-hugging blue dress, with beau Jordan Bratman —spending quality time together without new son Max.

After the museum opening, Richie and Madden hit up Clive Davis‘ Pre-Grammy party at the Beverly Hilton Hotel — but didn’t stay long.

“We have to get home!” Madden was overheard telling a friend at 11:40 p.m.. “She [Harlow] only sleeps three hours at a time. She’s with Grandma now, but if she wakes up…”