Breast cancer survivor Christina Applegate gave birth to baby girl Sadie Grace on January 27, and since then, mommy life has definitely changed the actress for the better.

The Married With Children star resides in L.A. with musician fiancé Martyn LeNoble, a Dutch bassist and founding member of Porno for Pyros, and they are over the moon with their new little bundle of joy.

The Hall Pass star opened up to PEOPLE, revealing:

"She's healed me in so many ways. She's just made my life so much better. She's opened my whole soul. I felt my heart literally open up for the first time and like wrap itself around her. It was profound. And I'm more in love with her every minute of the day."

Considering Applegate opted for a double mastectomy, after being diagnosed with breast cancer in 2008, she definitely appreciates the little things in life that much more.

The actress reveals:

"I want to be the ultimate burper and diaper-changer, I want to be the ultimate at all of it. Sometimes I stand there going, 'I'm not doing any of this right!' And then I get this big man belch out of her and I go, 'Ah, we accomplished this together'."

Congrats to the happy couple! Now when's the wedding?

Find out what Applegate had to say about going through her battle with breast cancer, after the jump ...

Christina Applegate and fiance Martyn LeNoble welcomed daughter Sadie Grace LeNoble last Thursday, her rep has confirmed.

Applegate's rep tells Us Weekly, "Mother and daughter are doing great," and LeNoble posted an update on his Facebook page yesterday that Sadie Grace weighed in at 7 lbs., 8 oz.

Christina Applegate and her fiance, musician Martyn Lenoble, are expecting a child together, her rep has confirmed to X17online.

Applegate, 38, and Lenoble, 41, got engaged this past Valentine's Day after two years of dating and this is the first child for both.

Lenoble has been with the Samantha Who? actress since she was diagnosed with breast cancer in 2008, and she has said in past interviews that he was a big part of her support system during that difficult time in her life.

Christina Applegate is engaged to musician Martyn LeNoble.

Her rep confirms to X17online that after two years of dating, 38-year-old Applegate and 41-year-old LeNoble decided to tie the knot. The couple got engaged on Valentine's Day, but have kept the news of their upcoming nuptials under wraps...until now.

Applegate divorced husband, actor Johnathon Schaech back in 2007 and underwent a double mastectomy in her fight against breast cancer in August 2008. As for LeNoble, he's a founding member of the rock band Porno for Pyros.

A wedding date has not been set.

Last night Christina Applegate went to Arclight in Hollywood to catch a movie with a mystery man, and she was all smiles when she stepped out of the theater. Think it had anything to do with the movie, or was she planning on getting lucky later?

Christina was looking a little down when leaving the Neil George Salon yesterday.

What's she so upset about? She just got her hair did at one of Hollywood's hottest salons and she has a hit show that's returning to the air next week. Well, there was that little cancer issue, but she beat that, too!

We heart Christina to pieces, we certainly hope there's nothing seriously wrong!

Since the Golden Globes were over the weekend, we decided to go with our favorite candid picture from the event... and how could we choose anything but the awkward near-kiss between Christina Applegate and Rita Wilson?

So sexy, right? So sexy and so weird!