April 27, 2010 at 04:11 PM EDT

Image Credit: Michael Desmond/ABC; Ron Tom/ABCIf you like Sarah and Luc together on Brothers & Sisters, then you’re going to love what I’m about to tell you…

Gilles Marini, who plays Sarah’s Harlequin-esque French beau, will be returning next season as a full-time series regular, according to showrunner David Marshall Grant. But while Sarah will be gaining a steady companion, she’ll be losing a sibling: Grant also confirms that Luke Grimes has completed his run as Walker half-brother Ryan.

News of the casting tweaks comes as the ABC drama is preparing to say goodbye to Rob Lowe. But Grant insists no further departures are planned. “There may be an episode or two that some [characters] might not be in,” he says, “but aside from Rob [and Luke], the [entire] cast is returning.”

Brothers & Sisters wraps its fourth season on May 16.

Thoughts? Happy Sarah’s officially off the market? And will you miss Ryan? Hit the comments!

TV scoop is best served instantaneously, so follow me on Twitter at @michaelausiello

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