Alec Baldwin thinks he'll have mastered the Spanish language by the age of "90".

Hilaria Baldwin and Alec Baldwin

Hilaria Baldwin and Alec Baldwin

The 58-year-old actor has been learning the language since he met his wife Hilaria - who was born in the Spanish-speaking island of Majorca - and has admitted he will only "nail it" when he's old and grey.

He said: "My Spanish can only get better. It can only improve... maybe by the time I'm 90, I will nail it.

"I love Madrid. I think it's one of my favourite cities in the world."

But the '30 Rock' actor will have to brush up on his skills earlier than expected, as his wife revealed they have decided to teach their daughter Carmen, three, to speak Spanish as her first language.

Hilaria, 32, said: "Carmen's first language is Spanish. I only speak Spanish with her...and with Alec she is smart enough to know that she needs to switch to English.

"Alec's Spanish is getting better and better. His accent is very good."

Meanwhile, Hilaria - who also shares 17-month-old Rafael and two-month-old Leonardo with the 'Beetlejuice' actor - is gearing up to release her book 'The Living Clearly Method: 5 Principles for a Fit Body, Healthy Mind & Joyful Life'.

Hilaria hopes her book will "help even more people" to achieve their fitness goals.

She told Hola! Magazine: "It has been a very natural process...I've been teaching for 12 years now ... you don't become a yoga teach for the teachings, you do it because you love it.

"Teaching is very fulfilling because every day I go home feeling like I helped people. Putting ideas into a book means I can help even more people by getting the book into everyone's hands."