- Lively helped Reynolds celebrate his 35th birthday
- The duo was photographed together outside Reynolds's Boston-area apartment
- The "Gossip Girl" star watched her "Green Lantern" costar ride his bike on set
Ryan Reynolds had quite a lively birthday -- literally!
Blake Lively was on hand at every turn during the weekend that Reynolds celebrated turning the big 3-5.
After the duo was photographed together on Saturday morning outside of Reynolds's Boston-area apartment -- and spotted out Thursday night in New York with Sandra Bullock -- Lively, 24, visited her new beau on his latest movie set in Boston on Sunday.
Poking her head out of Reynolds's trailer, the "Gossip Girl" star watched her "Green Lantern" costar ride his bike around the set of "R.I.P.D."
Lively didn't stop by empty-handed. Joined by her little Maltipoo Penny, the actress left her mini canine wrapped in balloons for the birthday boy.
"They are very much a couple," a source recently told PEOPLE. "They're really happy together."