The actress posts her first Instagram selfie of her and her three kids on her special day.
The two appear at Kate's birthday party at her house.
Guest Rachel Zoe shared this photo of the birthday girl's birthday cake.
The actress arrives at her surprise birthday coffee celebration.
Surprise!
The actress and her beau are all smiles at her surprise birthday coffee celebration.
The actress is all smiles in her party hat at her surprise birthday coffee celebration.
Erin Foster captured this snap of her sister with the Oscar winner at Kate's surprise birthday coffee celebration.
The surprise birthday coffee celebration guests take a selfie.
The two are all smiles at Kate's surprise birthday coffee celebration.
The birthday girl appears with her friends and family, including mom Goldie Hawn and Kurt Russell, at her surprise birthday coffee celebration.
The two pose together at the actress' surprise birthday coffee celebration.