On Monday, The Lord of the Rings stunner took to Instagram to post a series of black-and-white shots of her baby, who she shares with partner and sports manager David Gardner.
While Liv has published a slew of photos featuring Sailor's back, it's the first time she's shown off his beautiful face and features!
In the first heart-melting snap, little Sailor kicks back in a cosy romper with a teddy bear emblazoned on the front as he opens his mouth curiously and gazes at the camera.
“Our beautiful baby boy Sailor Gene Gardner 6 months old so so sooooo in love and grateful@davidgardner,” 38-year-old Liv lovingly penned.
In the second photo, the gorgeous guy playfully reaches for his minuscule foot looking utterly content.
Just last week the New York-based beauty, who also shares 10-year-old son Milo with ex-husband Royston Langdon, introduced Sailor to her Leftovers co-stars, including newly-married Justin Theroux who looked besotted as he cradled the cute bub.
Ahead of the birth of Sailor, the star admitted to Town & Country she was loving every minute of her second pregnancy.
“The most fun thing about being pregnant again is having those mom hormones flowing around. You're more present in your body, and it's making me a better mother for Milo,” Liv told the publication.