Sayyiduna Abu Hurayrah (may Allah be pleased with him) states: When the Prophet (peace and blessings be upon him) married Sayyidah Maymunah (may Allah be pleased with her), he was (at that time) in the state of ihram.
Al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains Abdullah bin Muhammad bin al-Mughirah, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب النكاح / 7407