Click to email a link to a friend (Opens in new window) Click to share on Twitter (Opens in new window) Click to share on Facebook (Opens in new window) Allison Williams and her boyfriend, Alexander Dreymon, made their red carpet debut on Wednesday after three years of dating. The actor adorably kissed his “Horizon Line” co-star’s cheek while they posed for pictures at the “M3GAN” premiere at Hollywood’s TCL Chinese Theatre. Williams stunned in a sequined gown, while the “Last Kingdom star” sported a plaid suit. The duo started seeing each other in 2019 and welcomed a baby boy…