The marketing representative - who split from fiancé Jake Pavelka last month - hosted a 'Fabulous And Single' party at Tao Lavo over the weekend.
According to People, she was seen dancing with friends - including fellow Bachelor contestant Ashleigh Hunt - at the venue and LAVO nightclub, toasting her single status.
One source claimed that the 24-year-old was "having a great time [and] was smiling the whole day".
Girardi met Pavelka on the 14th instalment of The Bachelor and became engaged on the ABC show's season finale, however the couple announced that they had ended their relationship in June.
She recently said that she is "happy" to have her life back and is looking forward to moving on.