"I want to see her happy that makes me happier than anything," Haylie Duff told PEOPLE.
Credit: Michael Simon

Hilary Duff‘s new man, Jason Walsh, has her older sister’s stamp of approval.

“I want to see her happy — that makes me happier than anything,” Haylie Duff told PEOPLE while hosting a dinner on behalf of T.J.Maxx, Marshalls and HomeGoods for their “Bring Back the Holidays” campaign last Thursday.

While on her tropical vacation in Puerto Vallarta, Mexico with Jason, Hilary sent her big sis a snap from the beachside destination. “I got a picture from her today of a beautiful beach that they were at,” shares Haylie, 31.

Exclusive... Premium: Hilary Duff And Jason Walsh Hang Out At The Beach In Puerto Vallarta ***NO INTERNET W/O PRIOR AGREEMENT***
Credit: FameFlynet

“I think she’s really happy, and that makes me happy,” adds the Real Girl’s Kitchen host.

Duff and Walsh were first linked in summer 2015 after they partied together to celebrate the grand opening event for his Rise Nation Fitness Studio in West Hollywood. Romance rumors continued to buzz throughout 2016 until Duff, 29, confirmed the two were dating last month.

“Date night with J,” the Younger actress captioned the sweet black-and-white shot of the two kissing.