In addition to soaking up the sun with boyfriend Jason Trawick during their recent Hawaiian getaway, the pop star toured a wedding chapel at Maui's Grand Wailea resort on Thursday and, two days later, teared up while watching a wedding below their hotel room balcony.
While the couple, who've been dating for more than a year, are going strong, they don't have any immediate plans to tie the knot just yet, a source tells PEOPLE.
"They're really taking things day by day and really enjoying their time," says the source, adding that Spears, who turns 29 in December, and Trawick, 38, "of course" talk about the future.
Another source credits the couple's relationship for helping the singer – who was previously married to Kevin Federline – to mature.
Trawick, who was previously Spears's agent, "really cares for her, deeply cares for the kids and loves her," says the second source.
Reporting by PERNILLA CEDENHEIM, JENNIFER GARCIA and MOMO ZHOU
For more on Britney and Jason's romantic Hawaiian getaway, pick up the new issue of PEOPLE, on newsstands Friday