Chelsea Clinton, the daughter of former US President Bill Clinton and former Secretary of State Hillary Clinton, has received her doctorate in international relations from Oxford University.
Bill Clinton tweeted he "couldn't be prouder" of his daughter, who was pictured in a tweet he posted, joined by her parents and her husband Marc Mezvinsky.
Chelsea Clinton, who is pregnant with her first child, previously completed a Master of Philosophy in the same subject at Oxford in 2003. Her father Bill also studied at Oxford under a Rhodes scholarship.
Bill and Hillary Clinton have tweeted their joy at news of their daughter Chelsea's pregnancy.
Hillary Clinton said she was "thrilled" at the news, which Chelsea revealed during a joint event with her mother.
Chelsea Clinton, the daughter of former US President Bill Clinton, has announced she is expecting her first baby.
According to US media, she revealed her pregnancy during a joint event with her mother Hillary, saying she was "very excited" that her first child was due to arrive later this year.