Hilary Duff is celebrating the holiday season like any proud mommy-to-be would - by flaunting her baby bump! 

The pregnant starlet tweeted a photo of herself with a painted holiday t-shirt, displaying a pretty green and red gift box over her belly. Duff completed the look with an adorable Santa hat and a big smile.

The t-shirt was apparently decorated by Hilary's sister, Haylie.

Happy holidays from the three of us!! @HaylieK what would I do without you and your artistic ways! Duff tweeted to her 200,000 followers on Thursday.

Evening spent painting my seester [sic] @HilaryDuff 's belly and hanging with my brother in law... Can't wait to meet my nephew. #HurryUp&GetHere posted Haylie afterwards.

Of course her bundle of joy will be the best Christmas gift a girl can get. But Duff got another Christmas miracle -- her sick pup Lola just arrived home after undergoing surgery. Could not have asked for a better gift! Got 2bring Miss Lola home 2day! she Tweeted Tuesday night. She is standing up by herself! And taking some steps! Big improvement! The 6-year-old pup was operated on in L.A. for undisclosed reasons. 

The beautiful 23-year-old has been photographed around Los Angeles looking absolutely glowing. The Daily Mail reported that Duff was seen pampering herself in Los Angeles, shopping at a cosmetics store in Studio City and for some designer duds in Beverly Hills.

Duff is reportedly due in March. She is expecting her first child, a baby boy, with husband Mike Comrie. She spoke to E! News about the pregnancy and had nothing but positive things to say.

I feel so lucky that I've had an easy pregnancy and I hope it stays that way, she said. I think feeling the baby move and getting those little kicks...seeing it happen through your shirt or looking at your belly, it's like, wow, there's a life inside of me.

She added: It's a piece of my husband and me and it's really wild.

Duff announced her pregnancy back in August with her hockey player hubby. During that time, the couple celebrated their first wedding anniversary.

Even though the news spread like wildfire, the blonde starlet tweeted that she still gets fans questioning her growing belly. So funny I still get tweets like 'omg are u prego?!' uuhhh YES I am... Very much soo! Lol, Hilary wrote