She took part in last week's Jersey 4 Jersey Benefit Show livestream in aid of theNew Jersey Pandemic Relief Fund.And she's also donated face masks to frontline healthcare workers during the COVID-19 crisis.But in between her good works, Halsey is making sure to keep her social media followers entertained by posting a series of fun and/or sexy selfies to her Instagram.On Sunday, the hitmaker, 25, showed off her cleavage in a very low-cut sundress with the photo caption: 'polka dots and sun-beams.' Wow factor: Halsey, 25, is keeping her Instagram followers entertained by posting a series of fun and/or sexy selfies and Sunday, she showed off her cleavage in a very low-cut sundressIn the photo, Halsey is seen wearing a red and white polka dot.