Seattle’s PWHL expansion team is loading up on star power, and its latest move comes at the Sirens’ expense.

The Post’s Madeleine Kenney confirmed Friday that Seattle inked forward Alex Carpenter to a one-year deal, the franchise’s fourth signing during its exclusive window.

The 31-year-old posted 43 points in 50 games with the Sirens after being one of their marquee signings in the PWHL’s inaugural season.

She was a surprising choice to be left unprotected by the Sirens, who were allowed to hang onto three players ahed of the pre-expansion draft period.

A first-team All-Star and key member of the US Women’s National Team, Carpenter joins forward Hilary Knight and Danielle Sedachny, along with defender Cayla Barnes, among Seattle’s first signings ahead of its first season.