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 / Updated  / Source: TODAY
By Randee Dawn

Older siblings don't always appreciate it when a newcomer joins the family. But we sense that Pink's daughter Willow Sage is going to enjoy her role as big sister!

The musician posted a sweet photo of her 5-year-old daughter changing a diaper on a toy doll Monday.

Just look at that intense concentration!

Pink (who is expecting her second child with husband Carey Hart) hasn't been too public with her current pregnancy, but recently posted a few other photos on Instagram to show us how far along she is.

There's this lovely posed shot of the 37-year-old with Willow from two weeks ago, when she announced she was expecting.

And this more irreverent post-Thanksgiving video.

"I have lived a lot of life in a very short time, and you get hardened a little bit — you get jaded, you build up walls. And when you see this little kid, and you get to watch them through infancy to toddler to little person, it's amazing," she told People last year about motherhood.

RELATED: Pink opens up about 10-year marriage to Carey Hart

We think everybody's going to be just fine!

Follow Randee Dawn on Twitter.