"Happy New Year from Sydney!! #HowToBeSingle," she wrote on Twitter.
"Fin de Año 2016 Fiesta Wild Wild West!! Feliz Año a todos!!NYE 2016 Wild Wild West Party!! Happy New Year everyone!!" Chris Hemsworth's wife wrote on Instagram.
"Happy New Year!" the former world boxing heavyweight champion and fiancé Hayden Panettiere wrote on Instagram.
NEXT GALLERY: Stars Celebrate Christmas 2015