Carrie Underwood Says Son Isaiah Is Her Biggest Accomplishment: He’s the ‘Little Sunshine in My World’

02/15/2016 at 06:30 PM ET

She may have just kicked off her Storyteller tour, but Carrie Underwood is already in need of a night off.

And what better way to celebrate than while walking the red carpet at Monday’s Grammy Awards at the Nokia Theatre in Los Angeles.

“We’re in random places sometimes and we’re just stuck with whatever we have. We’ve been really great and staying fit and being healthy while we’re on the road, making the best with what we’ve got,” the “Heartbeat” singer told E! News.

“But this is my little treat to myself this time. This is such a huge tour, we’re out for so long — I need some motivation.”

Carrie Underwood Grammys 2016 red carpet
Larry Busacca/Getty Images for NARAS

An evening out isn’t Underwood’s only recent treat: The singer showed off her stunning new Johnathon Arndt necklace, a Valentine’s Day present from husband Mike Fisher.

“[I’ve been] wearing it for no reason. Like, I’m in my pajamas in my room hanging out, just wearing this for no reason,” she joked. “I was like, ‘I’m not just gonna save it for red carpets. I’ve gotta put it on!’ ”

And while she’s nominated for best country solo performance for “Little Toy Guns,” Underwood admits her biggest accomplishment arrived in March 2015 when she welcomed son Isaiah Michael.

“My little guy is the little sunshine in my world every single day,” she said. “He’s back at the hotel right now. He’s smiley and sweet and happy and … he’s the best.”

— Anya Leon

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Aulia on

She looks thinner than pre-pregnancy.:/

Mary Lynn on

She has really changed her look ! Has she had a facelift or something?

OHBOY on

I love her but I thought this was Kate Gosselin at first, what is happening to her

KRB on

Her biggest accomplishment is dropping a kid? I always feel a little sorry for people who think that way. It doesn’t take a lot of effort to have a baby. Even cockroaches know how to f*ck. I’m glad she’s happy, though.

Lauren on

Um she looks thinner than before in this picture.

Gretchen on

Why isn’t it okay that she looks great, and thinner than before she was pregnant with a baby that will be a year old in a few days? I’m not sure what some of you are so shocked about…many women choose to eat healthy and exercise after having a baby and look better than ever. Not all women look like a blimp 3 years after giving birth. She looks fabulous, and sounds terrific!

Sarah on

She looks great! So happy for her.