12:53 PM PT -- BTW ... nearly 4 months ago, Maddison joined the "Zach Sang Show" and, along with actress Liz Gillies, played "F, Marry, Kill." The Hemsworths came up and Maddison took her shot ... with BOTH OF THEM, saying she wanted to bang them at the same time. One down, one more to go???
6:06 AM PT -- The girl strolling the streets with Liam is Australian actress Maddison Brown ... a star on the CW show "Dynasty."
Liam Hemsworth's showing the best way to get over an ex -- especially when she's moved on twice already -- is to move on yourself ... with another hot blonde.
Liam was spotted in NYC's West Village neighborhood Thursday holding hands with a mystery woman ... both of them rocking jackets and sunglasses. The two enjoyed a meal and some drinks together at Sant Ambroeus ... before going on a romantic stroll.