Timing between cosmetic surgeries
It is certainly acceptable to undergo 2 cosmetic surgeries 3 months apart, as long as you're in excellent health and have no complications from anesthesia.
Time Between Rhinoplasty and Breast Lift
I will answer your question by recommending that you do both procedures during the same operation. No need to wait.
Rhinoplasty and breast lift and implants
How about doing them all together? I commonly perform these procedures during the same operative setting. If you are going to stage them then you probably want to wait 3 months.
Timing of cosmetic procedures
I would think it would be fine to have breast lift surgery 3 months after a rhinoplasty. I would confirm this with your own surgeon (or surgeons) since they may have a particular preference as to timing of these procedures.