The 31-year-old singer, who just broke up with her fiance Jason Trawick, is said to have voluntarily handed back the huge 3.5-carat ring, designed by Neil Lane to Trawick, the Daily Mail reported.
The mother-of-two teamed her new ring with a simple yet flattering outfit of a white blouse and dark jeans, and was wearing her blonde hair tied halfback.
Spears, who was accompanied by a burly bodyguard, shielded her eyes in tinted sunglasses and wore the slightest hint of make-up including neutral lip-gloss.
Photos: SRK does garba, Nawazuddin takes 'shower' in bathtub
Photos: Soha Ali Khan, Evelyn Sharma, Urvashi Rautela at Mumbai airport
Spotted: Lara Dutta, Mahesh Bhupathi with their daughter in Bandra
Photos: SRK, Tamannaah Bhatia, Varun Dhawan at Mehboob Studio
Birthday special: Sushant Singh Rajput's journey from TV to films