Gwyneth Paltrow says Cameron Diaz's ''wisdom and loyalty'' gets her ''through life''.

The 44-year-old actress took to her Instagram account to wish her fellow Hollywood star and good friend a happy 45th birthday and admitted she ''adores'' the blonde beauty with all her ''heart''.

She wrote: ''Happy birthday @camerondiaz Your wisdom, humor, loyalty, cooking skills, guffaws, and ice cubes in rose get me through my life. I adore you with all my [heart] (And yes, we are wearing bibs in this picture) (sic)''

Gwyneth posted a selfie of the pair who were both wearing white bibs while nestling their heads against one another.

The 'Iron Man' star posted a similar birthday message to her pal last year when the 'Other Woman' actress turned 44.

She wrote: ''Dear @camerondiaz, before the day ends, I bid you a happy birthday, and I hit the ground with gratitude for getting to be one of the women who calls you a best friend.''

Cameron - who married Benji Madden in 2015 - recently admitted while speaking to Gwyneth at the Goop Wellness Summit that she stepped out of the spotlight because she didn't know who she was anymore.

She said: ''I just went, 'I can't really say who I am to myself.' Which is a hard thing to face up to. I felt the need to make myself whole.''

Benji also paid tribute to his wife on her birthday, writing: ''Happy Birthday to my Beautiful Wife I feel like I am the LUCKIEST guy ALIVE I don't think anyone could ever know the Depth, Kindness, and Compassion that I get to experience everyday thanks to My One and Only- You got me til the end baby (sic)''