Historical clue formulations

• Model featured on many romance novel covers — 2021-11-28
• Italian-born fashion model who became a U.S. citizen in 2016 — 2017-12-01
• Onetime spokesmodel for I Can't Believe It's Not Butter — 2013-01-19
• One-named Italian model — 2006-04-20
• First name of Pope Alexander VII — 1999-04-18