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The romance between Sandra Bullock and photographer Bryan Randall continues to bloom in full force, with one insider telling E! News they're "tied to the hip" when they're not busy working, and that Sandra is "more open to getting married again" since things got serious with her beau.

"They are enjoying the last bit of the summer with the kids until school starts. They will be in Los Angeles more once the kids start going to school. Things are very serious with them," the source said.

Earlier this summer, another insider noted that Sandra and Bryan share similar perspectives on parenting, which they've been able to help one another funnel into their relationships with Sandra's kids, Louis and Laila, and Bryan's daughter Skylar.

Onlookers at Universal Hollywood Studios who spotted Sandra and Bryan taking Louis on the rides noted Bryan "was very attentive" to the 6-year-old, whom Sandra adopted from New Orleans in 2010 after having spent a lot of time in the city, where she owns a home.

"You can tell [Bryan] really loves that kid," said a spy at the time.

"Sandra and Bryan are life partners. Their close friends have never seen Sandra this happy before. Sandra as of lately has been more open to the possibility of getting married again," E!'s source added. "Sandy has found her soul mate. Her friends and family love seeing Sandy so happy."

Although the pair began dating last summer, Sandra's maintained her privacy about the relationship as much as possible since then -- an understandable approach, given the high-profile end of her previous marriage to Jesse James, whom she divorced in 2010.

"They are the kind of people that would do a small wedding, if anything, or without anyone knowing if they decide to get married," a source told E! in June.

In the meantime, the actress is currently preparing to shoot "Ocean's Eight," according to imdb.