Avril Lavigne gets engaged, Robin Roberts goes on medical leave, and more

By Nuzhat Naoreen
August 31, 2012 at 04:00 AM EDT

Avril Lavigne, 27, got engaged to Nickelback singer Chad Kroeger, 37, on Aug. 8 in L.A.

Rosie O’Donnell, 50, announced on Aug. 27 that she and fiancée Michelle Rounds had secretly wed in NYC in June…. Singer Rufus Wainwright, 39, got hitched to his partner, Jorn Weisbrodt, on Aug. 23 in Montauk, N.Y.

Just two months after their sudden split, Tom Cruise, 50, and Katie Holmes, 33, finalized their divorce in New York City on Aug. 20…. NCIS: Los Angeles star LL Cool J, 44, confronted a burglar at his Sherman Oaks, Calif., home on Aug. 22, detaining the man until police arrived. The alleged intruder, Jonathan A. Kirby, 56, has been charged with first-degree burglary.

Good Morning America cohost Robin Roberts, 51, is slated to begin medical leave on Aug. 31 as she prepares for a bone-marrow transplant. Roberts, who announced that she had been diagnosed with myelodysplastic syndrome in June, will be gone for a couple of months, says a show rep.

Astronaut Neil Armstrong, the first man to set foot on the moon, died in Cincinnati on Aug. 25 due to complications from cardiovascular procedures. He was 82…. Jerry Nelson, 78, the puppeteer behind Sesame Street‘s beloved Count von Count, passed away Aug. 23 at his home on Cape Cod after a battle with emphysema.

September 1: Barry Gibb, 66
September 2: Salma Hayek, 46; Keanu Reeves, 48
September 4: Beyoncé, 31
September 7: Evan Rachel Wood, 25