Sandra Bullock can't hide her proud smile as she drops little Louis off at school

There is no doubt who the leading man is in Sandra Bullock's life - her adorable son Louis.

And by the smile on the 49-year-old star's face on Friday, being mother to her three-year-old is clearly the role she relishes most.

The Oscar winning actress was spotted dropping off her little man at school in Los Angeles and seemed to delight in the simple joys of the school run.

Off we go! Sandra Bullock drops son Louis off at school on Friday

The Gravity star dressed for comfort for the outing but still looked lovely in a casual and cosy ensemble consisting of black leggings, grey hooded sweatshirt and a puffy
jacket.

Given the chilly wintery weather the actress sensibly opted for a pair of cosy black wedge Mukluk boots as her footwear of choice.

With a navy baseball cap pulled down over her hair and a pair of aviator sunglasses shielding her eyes the actress looked every inch the Hollywood star.

Louis, meanwhile, looked adorable as always in turned-up jeans, a grey T-shirt and plaid shirt.

All smiles: The Oscar winning actress happily chatted away to other parents at the school

Her little man! The three year old looked excited to be at school as his famous mother escorted him into the building

The fashionable youngster sported a pair of trendy Nike velcro trainers and wore a dark grey jacket over his casual outfit.

Whilst Louis looked out for his friends his famous mother beamed as she chatted away with other parents at the school.

Sandra looked as youthful as ever on the outing with her son whom she adopted as a single mother back in 2010.

The star recently revealed that she's happy for Louis to be the only man in her life saying: 'My son is three years old, which is an amazing age. Four is an even better age. So if something happens, great, but if not, I've got plenty to do.'

Low key: The actress dressed down for the school run in comfortable active wear 

In fact, Sandra relishes her role as mum so much that she says she is open to the idea of having more children.
'If all of a sudden my house had eight kids in it, if it was OK with Louis and it felt like a good safe family, I would be fine with that,' she said.
'It would be because that is what my home is for. So it is up to him. He is the boss of the house so I have to abide by his rules,' she added.

Mom duty: With the school run over the Gravity actress gets back into her SUV to run errands