VIDEO : Ariana and Pete 'Were Very Affectionate' at Party Before Engagement News

Just one day prior to the news of their engagement, Ariana Grande and Pete Davidson celebrated another special occasion together ? the birthday of the 24-year-old pop star?s mother. The newly minted fiancés attended a party for the ?No Tears Left to Cry? singer?s mom in the private dining room of Mastro?s Beverly Hills on Sunday, June 10, where they weren?t afraid to show a little PDA, an eyewitness tells Us Weekly exclusively. The onlooker notes that the two ?were very affectionate and kissed each other throughout the night.?