Hilary Duff hides bump in comfy layers while out with son Luca after revealing 'Baby B is growing'

She's wearing a special glow as she gets ready to have her second child.

Hilary Duff was seen out in LA with her six-year-old son Luca, looking amazing as she kicked off her week.

The 30-year-old star was clad in a black T-shirt with black leggings and a denim shirt tied around her waist, toting a large water bottle and an iPhone.

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Summer breeze: Hilary Duff, 30, was seen out in LA with her six-year-old son Luca, looking amazing as she kicked off her week

Summer breeze: Hilary Duff, 30, was seen out in LA with her six-year-old son Luca, looking amazing as she kicked off her week

Luca wore a white T-shirt with patterned shorts, and olive green shoes. Her blonde locks were down and she wore large hoop earrings and black Nike sneakers with blue laces.

Earlier Monday, Duff shared a shot of herself and boyfriend Matthew Koma, 31, as they stood in what appeared to be a restaurant with a large sculpture of crossed knives on the brick wall. 

She gushed about the growth she's experiencing - both her child and in her relationship - while dropping a prospective clue about her daughter's name.

'Everyday we are growing...Baby B is growing ...growing is nice with you,' she said, spurring speculation that her daughter's name will begin with the letter B.

Gorgeous: The actress looked healthy and beautiful as she pumped gas into her SUV

Gorgeous: The actress looked healthy and beautiful as she pumped gas into her SUV

Dropping a hint: Duff referred to a 'Baby B' in an Instagram post alongside her beau Matthew Koma, 31

Dropping a hint: Duff referred to a 'Baby B' in an Instagram post alongside her beau Matthew Koma, 31

Earlier this month, the actress, who was previously married to Luca's dad and hockey player Mike Comrie, told social media site Instagram that she and Koma, a native of Long Island, were expecting.

'Guess what guys!' the 5ft2 beauty wrote. Koma 'and I made a little princess of our own and we couldn't be more excited!!!!!!'

The Houston native said subsequently said in a radio interview with Ryan Seacrest that while she would have been happy to give her son a younger brother, she was really hoping for a daughter this time around.

Music to my ears: Koma, like Hilary, is an entertainment industry pro having worked with performers such as Shania Twain and Tiesto

Music to my ears: Koma, like Hilary, is an entertainment industry pro having worked with performers such as Shania Twain and Tiesto

'I just wanted one of each ... it was funny that I cared so much,' she told Seacrest, adding that she had 'close family and friends over' for a Mother's Day gender reveal bash last month.

As for Koma, like Hilary, is an entertainment industry pro having worked with performers such as Shania Twain and Tiesto.

He previously dated Call Me Maybe artist Carly Rae Jepsen.

Cut to the feeling! Hilary's beau previously dated Call Me Maybe artist Carly Rae Jepsen

Cut to the feeling! Hilary's beau previously dated Call Me Maybe artist Carly Rae Jepsen

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