the Prophet got married while he was a Muhrim (in Ihram).  

أَنَّ النَّبِيَّ ﷺ نَكَحَ وَهُوَ مُحْرِمٌ  

that the Messenger of Allah married her when he was Halal (not in Ihram). (Sahih).He (one of the narrators-Yazid) said: "And she was my maternal aunt and the maternal aunt of Idn 'Abbas also."  

أَنَّ رَسُولَ اللَّهِ ﷺ تَزَوَّجَهَا وَهُوَ حَلاَلٌ قَالَ وَكَانَتْ خَالَتِي وَخَالَةَ ابْنِ عَبَّاسٍ  

"The Messenger of Allah said: 'The one in lhram should not get married, nor arrange a marriage for anyone else, nor Propose marriage''  

عَنْ نُبَيْهِ بْنِ وَهْبٍ عَنْ أَبَانَ بْنِ عُثْمَانَ بْنِ عَفَّانَ عَنْ أَبِيهِ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ الْمُحْرِمُ لاَ يَنْكِحُ وَلاَ يُنْكِحُ وَلاَ يَخْطُبُ