Reese Witherspoon's new baby is legally cute!

The Legally Blonde star brought her five-month-old son Tennessee and 13-year-old daughter Ava with her to a birthday party in L.A. on March 9, according to Us Weekly.

Tennessee was wearing an adorable green-and-purple plaid shirt and white bonnet, while Reese wore a magenta sweater with jeans and leopard-print shoes.

You can see a pic of Reese heading to the party with her two kids here. Just try not to squeal with delight when you see Tennessee's little outfit. 

Tennessee's dad is Reese's husband Jim Toth, while Reese had Ava and eight-year-old son Deacon with ex-husband Ryan Phillippe.

And it sounds like Ava loves being a big sis. 

"She's so awesome!" Reese has said of Ava's sisterly support to her little bros. Sure enough, Ava can be seen holding a couple of rattles for Tennessee in the pics as they walk to the party.

Is this family the cutest or what?

Source: Us Weekly