She is a famous celeb.
wealthy person; rich person; socialite
Often implies a glamorous, high-society lifestyle beyond just being rich. Common in Japanese media.
That restaurant is frequented by wealthy socialites.
Since getting married, she has been living a glamorous, wealthy lifestyle.
He succeeded in business and became a wealthy celebrity.
I stayed at a luxury hotel and felt like a celebrity for a night.
金持ち simply means a rich person, whereas セレブ implies a stylish, high-profile, celebrity-like life beyond just having money.
セレブ is a casual loanword used mainly for glamorous or wealthy celebrities in media/gossip contexts, while 著名人 is neutral and can apply to any well-known figure, including scholars or officials.
marrying into wealth; celebrity marriage
Abbreviation of セレブリティー, from English 'celebrity'. The extended meaning 'wealthy/glamorous person' developed in Japanese usage.