It happened around 11:30 p.m. Saturday as the groom was walking toward National Mechanics Restaurant on South 3rd Street.
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Police say the victim was getting some fresh air during his wedding reception when he was robbed of his Rolex watch by two armed men.
The suspects were able to get away after the theft.
The men were described as wearing all black and reportedly fled in a dark-colored vehicle.
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The groom was not injured in the incident.
Police are also investigating as many as eight armed robberies that have taken place in Center City in recent weeks, but investigators have not said if the Old City incident is connected.
SEE ALSO: Philadelphia police investigate string of armed robberies across Center City
Police investigate string of armed robberies across Center City
On Friday evening, police say three armed men, believed to be in their late 20s, stole money and jewelry from pedestrians near 22nd and Sansom streets.
Another similar incident was recently reported on Mozart Place just off Rittenhouse Square.
Action News also obtained video of a theft that happened on Tuesday along the 1800 block of Cuthbert Street. In that incident, police say two victims were robbed of their Rolex watches worth $37,000.
Officials confirm similar armed robberies also date back to September.
No arrests have been made in connection with these violent thefts. Anyone with any information is asked to call police at 215-686-TIPS.