Lui è così bello.
Bella persona is a literal Italian equivalent of the English phrase "beautiful person." The feminine singular adjective and noun also may be translated into English as "handsome person" according to the gender of the person in question. The pronunciation will be "BEL-la per-SO-na" in Italian.
Sei così bella, ragazza! is an Italian equivalent of the English phrase "You're so beautiful, girl!" The feminine singular phrase also translates literally as "You're so beautiful, girlfriend!" in English. The pronunciation will be "sey ko-SEE BEL-la ra-GAT-tsa" in Pisan Italian.
"The sun's beautiful woman" is one English equivalent of the Italian phrase bella donna del sole. The pronunciation will be "BEL-la DON-na del SO-ley" in Italian.
"So adorable!" in English is Cosí adorabile! in Italian.
"You are so handsome!" in English is Sei così bello! in Italian.
"So good!" in English means Che bello! in Italian.
"So are you" in English means Anche tu lo sei in Italian.
"I am so tired!" in English is Sono così stanco! in Italian.
Così felice! in Italian is "So happy! in English.
"You look so sexy!" in English is Sembri così sexy! in Italian.
"I'm so glad!" in English is Sono così felice! in Italian.
"You're so handsome!" in English is Sei così bello! in Italian.