February 11, 2015 05:15 PM

Happy birthday, Alena Rose!

Kevin Jonas and wife Danielle were joined by 130 friends and family to celebrate their daughter’s first birthday with a bubble-themed bash on Saturday.

And with so much to see and do — including playing in a bubble palace and taking a ride on the toy train – the proud parents could hardly keep up with their little girl.

“She’s walking — that’s new! It’s pretty crazy,” Kevin, 27, told PEOPLE at Alena’s party with Dreft at The Venetian in Garfield, New Jersey.

And this milestone is a recent one. “It was two weeks ago. She started stumbling a little bit, and now she’s a pro. We hardly see her crawl,” mom Danielle, 28, adds.

“She gets up on her own without holding on to anything. It just happened overnight! Everybody would say to me, ‘It’s going to go so fast,’ and I used to hate that. It’s really true.”

Diane Bondareff/Invision/Dreft

Alena, who officially turned 1 on Feb. 2, isn’t just walking these days: She’s talking, too.

So what are some of her favorite words? “‘Mama’ when she’s upset,” says Danielle.

“Which is hilarious,” quips Kevin. “‘Dada,’ ‘Mama,’ ‘baba’ for her bottle.”

“She kind of says, ‘Sit.’ She’ll just say the ‘S,’ though — it’s cute!” says Danielle.

Although Kevin and Danielle are mesmerized by their daughter, Kevin is happy to step back when it comes to Alena’s dirty diapers. “I help a little bit,” he admits. “[Danielle’s] the queen, she definitely handles it.”

The couple — who celebrated their fifth wedding anniversary in December — “love every minute” of watching their little girl grow up, adds Kevin.

And his post-boy band life couldn’t be any sweeter for the former Jonas Brothers — or his former bandmates. “We’re all doing our own thing and we’re really happy,” Kevin shares of brothers Joe, 25, and Nick, 22. “We appreciate the time we spend together. It was just time for us to take a break.”

Despite their split, Kevin is still there to support his younger brothers’ success. “I’m really happy for [Nick]. He has a number one song,” he says of his “Jealous” hit. “It’s a big deal. I’m really happy for him.”

As for Kevin, he has started his own construction business, tech company and recently completed a run on Celebrity Apprentice after being voted off in January.

“It was great. It was a lot of hard work and a lot of fun and crazy at the same time,” he says of the reality show. “It’s grueling. People don’t realize it’s day after day after day and it’s just a lot.”

With so much on their plate as new parents, the couple have quickly learned that alone time is hard to come by. “[Before the baby], we always had our time, we always went on dates,” explains Danielle.

But the first-time parents couldn’t be happier with their life as a family of three.

“There is a learning curve for sure. You start out not knowing anything and by the end of it you come out as experts in your own way,” Kevin says of parenthood. “She’s unbelievable, she really is — we couldn’t have done better.”

Diane Bondareff/Invision/Dreft

— Jeff Nelson with reporting by Diane Herbst

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